{
  "id": "ring",
  "title": "Ring / Ringu / Sadako",
  "description": "Compare Ring reading and watch order across Suzuki’s prose world, the incompatible Japanese film sequels, television adaptations, Korean and American remakes, licensed manga, games and original spin-offs. Japanese dates and elapsed intervals take priority over localization and release-order guesses.",
  "continuities": [
    {
      "id": "suzuki",
      "label": "Suzuki prose — Ring / Spiral / Loop / Birthday / Tide / S",
      "note": "The original biological / simulated-world history. Loop’s outer world and simulated years do not share one ordinary calendar. Tide’s main story precedes S despite later publication."
    },
    {
      "id": "nakata",
      "label": "Japanese films — Ring → Ring 2 → Sadako",
      "note": "Ring 0’s past leads to Ring; Ring 2 and returning Masami distinguish this route from Spiral. Film-derived manga / prose stay beside their stories with adaptation status."
    },
    {
      "id": "rasen",
      "label": "Japanese films — Ring → Spiral → Sadako 3D / 3D2 / DX",
      "note": "The Ando / Takayama resurrection route. Later 3D and DX links are qualified where original testimony / scene evidence remains incomplete."
    },
    {
      "id": "tv95",
      "label": "Ring (1995 television film)",
      "note": "Kanzenban is an expanded home-video cut of the same adaptation, not another sequel."
    },
    {
      "id": "tv99",
      "label": "Ring: The Final Chapter → Rasen (TV)",
      "note": "Fuji’s 12-episode and 13-episode serials; thirteen-day curse and changed protagonists differ from films and novels."
    },
    {
      "id": "korea",
      "label": "The Ring Virus — Korean remake",
      "note": "Sun-ju and Eun-suh’s Korean / Japanese co-production, not Reiko’s next case."
    },
    {
      "id": "samara",
      "label": "The Ring — Samara Morgan",
      "note": "American remake, 2005 Rings short, The Ring Two and 2017 Rings; no unsupported split solely because later film omits Rachel."
    },
    {
      "id": "connected",
      "label": "Other official stories / reimaginings",
      "note": "Inclusive shelf for licensed original prose, game worlds, comedy and live experiences. These records are not a claim that unrelated versions share one history."
    },
    {
      "id": "crossover",
      "label": "Sadako vs. Kayako",
      "note": "Film / junior adaptation and the adult ORIGINAL crossover novel distinguished. The two-day curse differs from the core seven-day film rule."
    }
  ],
  "entries": [
    {
      "id": "lemon",
      "title": "Birthday — Lemonheart",
      "type": "Prose short",
      "date": "Sadako’s theater years; about 25–30 years before Ring",
      "order": 1965,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Sadako’s stage career and doomed romance.",
      "note": "Separate prequel story, not all of Birthday placed after Loop. Exact 1960s year not asserted without Japanese text.",
      "sourceIds": [
        "birthday",
        "prose-date"
      ],
      "continuity": "suzuki",
      "railLabel": "Sadako’s theater years; about 25–30 years before Ring",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.penguinrandomhouse.com/books/175549/birthday-by-koji-suzuki/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true,
      "storyGroup": "suzuki:lemon"
    },
    {
      "id": "lemon-frame",
      "title": "Birthday — Lemonheart, older Toyama frame",
      "type": "Prose segment",
      "date": "est. late 1980s–1990s; Decades after Sadako’s theater career",
      "order": 1990,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "The later reminiscence framing her story.",
      "note": "Earlier theater scenes and later recollection distinguished; full text needed for an exact year and page boundaries. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "birthday"
      ],
      "continuity": "suzuki",
      "railLabel": "est. late 1980s–1990s",
      "segment": true,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.penguinrandomhouse.com/books/175549/birthday-by-koji-suzuki/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "birthday",
      "eraWindow": true
    },
    {
      "id": "prose-ring",
      "title": "Ring — Koji Suzuki novel",
      "type": "Novel",
      "date": "September–October; est. late 1980s–early 1990s",
      "order": 1990,
      "canon": "Confirmed canon",
      "release": "1991",
      "description": "Kazuyuki Asakawa investigates a fatal videotape.",
      "note": "Japanese opening uses September 5 deaths without an established opening calendar year in the critical reading. Do not promote an English-edition year to universal Japanese canon. Earlier Shizuko / Sadako history embedded.",
      "sourceIds": [
        "ring",
        "prose-date"
      ],
      "continuity": "suzuki",
      "railLabel": "September–October; est. late 1980s–early 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/199999188001/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "suzuki:ring-novel"
    },
    {
      "id": "prose-spiral",
      "title": "Spiral / Rasen — Koji Suzuki novel",
      "type": "Novel",
      "date": "est. late 1980s–early 1990s; Immediately after Ryuji’s death; months after Ring’s opening",
      "order": 1990.1,
      "canon": "Confirmed canon",
      "release": "1995",
      "description": "Mitsuo Ando examines his dead friend.",
      "note": "Biological resurrection route. Novel’s male Asakawa family and Ando history differ from 1998 screen adaptation. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "spiral"
      ],
      "continuity": "suzuki",
      "railLabel": "est. late 1980s–early 1990s",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/199999188003/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "floating",
      "title": "Birthday — Floating Coffin",
      "type": "Prose short",
      "date": "est. late 1980s–early 1990s; After Ryuji’s death; overlaps Spiral",
      "order": 1990.11,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Mai Takano’s missing period.",
      "note": "Companion viewpoint in the same interval, not a post-Loop event. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "birthday"
      ],
      "continuity": "suzuki",
      "railLabel": "est. late 1980s–early 1990s",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.penguinrandomhouse.com/books/175549/birthday-by-koji-suzuki/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "suzuki:floating"
    },
    {
      "id": "loop-young",
      "title": "Loop — Kaoru’s childhood / father’s research history",
      "type": "Novel segment",
      "date": "Kaoru’s childhood; outer-world research era",
      "order": 1990,
      "canon": "Confirmed canon",
      "release": "1998",
      "description": "Kaoru grows up around a simulation project.",
      "note": "Outer-world calendar must not be equated to Ring’s simulated calendar. Sort anchor is only a reading / relative placement aid.",
      "sourceIds": [
        "loop-s"
      ],
      "continuity": "suzuki",
      "railLabel": "Kaoru’s childhood; outer-world research era",
      "segment": true,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.penguinrandomhouse.com/series/RTG/ring-hardcover/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "loop",
      "eraWindow": true
    },
    {
      "id": "loop-adult",
      "title": "Loop — adult Kaoru / cancer investigation",
      "type": "Novel",
      "date": "Kaoru a medical student; years after his childhood",
      "order": 1990.3,
      "canon": "Confirmed canon",
      "release": "1998",
      "description": "Kaoru investigates a spreading cancer.",
      "note": "Different clock domain from the simulated Ring / Spiral years. Numeric sort anchor preserves the revelation sequence without inventing a common calendar.",
      "sourceIds": [
        "loop-s"
      ],
      "continuity": "suzuki",
      "railLabel": "Kaoru a medical student; years after his childhood",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.penguinrandomhouse.com/series/RTG/ring-hardcover/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": false,
      "workId": "loop"
    },
    {
      "id": "happy",
      "title": "Birthday — Happy Birthday",
      "type": "Prose short",
      "date": "After Kaoru’s disappearance in Loop; months later",
      "order": 1990.4,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Reiko follows the Loop project.",
      "note": "The prose collection’s actual Loop epilogue. Not in MEIMU’s manga collection.",
      "sourceIds": [
        "birthday"
      ],
      "continuity": "suzuki",
      "railLabel": "Months after Kaoru’s medical-student era",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.penguinrandomhouse.com/books/175549/birthday-by-koji-suzuki/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "tide-main",
      "title": "Tide — Kashiwada investigation",
      "type": "Novel",
      "date": "est. late twentieth–early twenty-first century; After Spiral / Loop revelations; before S main action",
      "order": 2000,
      "canon": "Confirmed canon",
      "release": "2013",
      "description": "Kashiwada investigates his memories and Sadako’s family.",
      "note": "Later publication is not later fictional sequence. Full Japanese text needed for exact year and ancient / childhood recollections; neither 2013 nor film Sadako’s present is automatically correct. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "tide",
        "tide-first"
      ],
      "continuity": "suzuki",
      "railLabel": "est. late twentieth–early twenty-first century",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/321511000305",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "s-main",
      "title": "S / エス",
      "type": "Novel",
      "date": "Takanori Ando’s adulthood; about a generation after Spiral",
      "order": 2010.5,
      "canon": "Confirmed canon",
      "release": "2012",
      "description": "An online suicide video threatens Takanori and Akane.",
      "note": "Original prose, not Fuji Dario’s Sadako 3D novelization. Date measured by Ando’s son growing up; exact contemporary year unverified.",
      "sourceIds": [
        "loop-s"
      ],
      "continuity": "suzuki",
      "railLabel": "Takanori Ando’s adulthood; about a generation after Spiral",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.penguinrandomhouse.com/series/RTG/ring-hardcover/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "ub-serial",
      "title": "Ubiquitous — published 文芸カドカワ serial",
      "type": "Serial novel",
      "date": "est. early twenty-first century; After Tide / S; renewed Loop-world crisis",
      "order": 2011,
      "canon": "Assumed canon",
      "release": "2016–2017",
      "description": "Published continuation associated with Ryuji and the Loop.",
      "note": "Author testimony connects the project; publisher verifies the final serialized installment. Exact relation of serialized / rewritten text needs comparison. Do not call all of it unreleased. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "ub-author",
        "ub-serial",
        "ub-variants"
      ],
      "continuity": "suzuki",
      "railLabel": "est. early twenty-first century",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://kadobun.jp/news/info/20.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "nagai",
      "title": "Ring — Kojiro Nagai manga",
      "type": "Manga",
      "date": "Ring’s contemporary videotape case; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1996",
      "description": "First manga adaptation of Suzuki’s novel.",
      "note": "Same story position with adaptation changes qualified; not Inagaki’s subsequent screenplay manga.",
      "sourceIds": [
        "nagai"
      ],
      "continuity": "suzuki",
      "railLabel": "Ring’s contemporary videotape case; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kodansha.co.jp/comic/products/0000033662",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true,
      "storyGroup": "suzuki:ring-novel"
    },
    {
      "id": "radio",
      "title": "Kadokawa Drama Renaissance — Ring radio drama / CD",
      "type": "Audio drama",
      "date": "Ring’s videotape case; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1996",
      "description": "Dramatized audio adaptation.",
      "note": "Three discs are one adaptation. Not score-only soundtrack; exact original broadcast / additional scenes need audio inspection.",
      "sourceIds": [
        "radio"
      ],
      "continuity": "suzuki",
      "railLabel": "Ring’s videotape case; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.oricon.co.jp/prof/173939/products/206616/1/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "Read corresponding work / edition research",
      "eraWindow": true,
      "storyGroup": "suzuki:ring-novel"
    },
    {
      "id": "mlemon",
      "title": "Birthday manga — Lemonheart",
      "type": "Manga story",
      "date": "Sadako’s theater years; decades before Ring",
      "order": 1965,
      "canon": "Assumed canon",
      "release": "1999",
      "description": "The prequel story retold by MEIMU.",
      "note": "Same-story adaptation beside source. Its contents differ from prose collection, which also includes Happy Birthday.",
      "sourceIds": [
        "mbirthday"
      ],
      "continuity": "suzuki",
      "railLabel": "Sadako’s theater era; decades before the tape",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://manga.line.me/product/periodic?id=S131934",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "suzuki:lemon"
    },
    {
      "id": "mfloating",
      "title": "Birthday manga — Floating Coffin",
      "type": "Manga story",
      "date": "est. late 1980s–early 1990s; After Ryuji’s death; overlaps Spiral",
      "order": 1990.11,
      "canon": "Assumed canon",
      "release": "1999",
      "description": "Mai’s missing period in manga.",
      "note": "Same source position, with film / prose character compatibility still to inspect. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "mbirthday"
      ],
      "continuity": "suzuki",
      "railLabel": "est. late 1980s–early 1990s",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://manga.line.me/product/periodic?id=S131934",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "suzuki:floating"
    },
    {
      "id": "msadako",
      "title": "Birthday manga — SADAKO",
      "type": "Manga story",
      "date": "est. mid-twentieth century; Sadako’s earlier life; before the videotape case",
      "order": 1960,
      "canon": "Assumed canon",
      "release": "1999",
      "description": "An original companion story in the manga collection.",
      "note": "Distinct third story replacing prose Happy Birthday. Exact historical frames remain unverified; do not label it a Loop epilogue. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "mbirthday"
      ],
      "continuity": "suzuki",
      "railLabel": "est. mid-twentieth century",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://manga.line.me/product/periodic?id=S131934",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "zero-nakata",
      "title": "Ring 0: Birthday",
      "type": "Film",
      "date": "1968; decades before the videotape investigation",
      "order": 1968,
      "canon": "Confirmed canon",
      "release": "2000",
      "description": "Sadako’s film-specific theater tragedy.",
      "note": "Film version of Lemonheart; two Sadakos and final well scene differ from prose. Shared prequel shown in both film route selections; no duplicate distinct-film count.",
      "sourceIds": [
        "film-zero",
        "arrow"
      ],
      "continuity": "nakata",
      "railLabel": "1968; decades before the videotape investigation",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "sharedWork": "ring-zero",
      "storyGroup": "nakata:ring-zero"
    },
    {
      "id": "film-ring-nakata",
      "title": "Ring / Ringu (1998)",
      "type": "Film",
      "date": "Late summer / September; est. 1997",
      "order": 1997,
      "canon": "Confirmed canon",
      "release": "1998",
      "description": "Reiko investigates the cursed tape.",
      "note": "Common source film for two incompatible sequels. Film’s earlier Shizuko / Sadako recollections are not prose chronology; exact 1997 calendar remains qualified pending props.",
      "sourceIds": [
        "film-ring",
        "arrow"
      ],
      "continuity": "nakata",
      "railLabel": "Late summer / September; est. 1997",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "sharedWork": "ring-film",
      "storyGroup": "nakata:ring-film"
    },
    {
      "id": "inagaki-nakata",
      "title": "Ring — Misao Inagaki upper / lower manga volumes",
      "type": "Manga",
      "date": "The film’s videotape case; est. late 1990s",
      "order": 1997,
      "canon": "Assumed canon",
      "release": "1998–1999",
      "description": "Screenplay-derived manga reworking.",
      "note": "Continuous two-volume adaptation grouped; 2005 Ring: Curse is a collected edition with Inagaki / Sakura credits. Additional contents need interior review before counting another story.",
      "sourceIds": [
        "inagaki"
      ],
      "continuity": "nakata",
      "railLabel": "The film’s videotape case; est. late 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/200503000169/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "sharedWork": "ring-inagaki",
      "storyGroup": "nakata:ring-film",
      "eraWindow": true
    },
    {
      "id": "mzero-nakata",
      "title": "Ring 0 — MEIMU manga",
      "type": "Manga",
      "date": "1968; theater prequel period",
      "order": 1968,
      "canon": "Assumed canon",
      "release": "2000",
      "description": "The film prequel retold as manga.",
      "note": "Distinct from Birthday manga’s Lemonheart. Same adaptation position, full panels not inspected.",
      "sourceIds": [
        "mzero"
      ],
      "continuity": "nakata",
      "railLabel": "1968; theater prequel period",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/199999853172/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "sharedWork": "ring-zero-manga",
      "storyGroup": "nakata:ring-zero"
    },
    {
      "id": "zero-rasen",
      "title": "Ring 0: Birthday",
      "type": "Film",
      "date": "1968; decades before the videotape investigation",
      "order": 1968,
      "canon": "Confirmed canon",
      "release": "2000",
      "description": "Sadako’s film-specific theater tragedy.",
      "note": "Film version of Lemonheart; two Sadakos and final well scene differ from prose. Shared prequel shown in both film route selections; no duplicate distinct-film count.",
      "sourceIds": [
        "film-zero",
        "arrow"
      ],
      "continuity": "rasen",
      "railLabel": "1968; decades before the videotape investigation",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "sharedWork": "ring-zero",
      "storyGroup": "rasen:ring-zero"
    },
    {
      "id": "film-ring-rasen",
      "title": "Ring / Ringu (1998)",
      "type": "Film",
      "date": "Late summer / September; est. 1997",
      "order": 1997,
      "canon": "Confirmed canon",
      "release": "1998",
      "description": "Reiko investigates the cursed tape.",
      "note": "Common source film for two incompatible sequels. Film’s earlier Shizuko / Sadako recollections are not prose chronology; exact 1997 calendar remains qualified pending props.",
      "sourceIds": [
        "film-ring",
        "arrow"
      ],
      "continuity": "rasen",
      "railLabel": "Late summer / September; est. 1997",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "sharedWork": "ring-film",
      "storyGroup": "rasen:ring-film"
    },
    {
      "id": "inagaki-rasen",
      "title": "Ring — Misao Inagaki upper / lower manga volumes",
      "type": "Manga",
      "date": "The film’s videotape case; est. late 1990s",
      "order": 1997,
      "canon": "Assumed canon",
      "release": "1998–1999",
      "description": "Screenplay-derived manga reworking.",
      "note": "Continuous two-volume adaptation grouped; 2005 Ring: Curse is a collected edition with Inagaki / Sakura credits. Additional contents need interior review before counting another story.",
      "sourceIds": [
        "inagaki"
      ],
      "continuity": "rasen",
      "railLabel": "The film’s videotape case; est. late 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/200503000169/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "sharedWork": "ring-inagaki",
      "storyGroup": "rasen:ring-film",
      "eraWindow": true
    },
    {
      "id": "mzero-rasen",
      "title": "Ring 0 — MEIMU manga",
      "type": "Manga",
      "date": "1968; theater prequel period",
      "order": 1968,
      "canon": "Assumed canon",
      "release": "2000",
      "description": "The film prequel retold as manga.",
      "note": "Distinct from Birthday manga’s Lemonheart. Same adaptation position, full panels not inspected.",
      "sourceIds": [
        "mzero"
      ],
      "continuity": "rasen",
      "railLabel": "1968; theater prequel period",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/199999853172/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "sharedWork": "ring-zero-manga",
      "storyGroup": "rasen:ring-zero"
    },
    {
      "id": "film-two",
      "title": "Ring 2",
      "type": "Film",
      "date": "Four weeks after Ring; est. late 1997",
      "order": 1997.1,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Mai and Yoichi face the curse’s aftermath.",
      "note": "Alternative to Spiral. Four-week interval preferred to incorrectly using 1999 release as story date.",
      "sourceIds": [
        "film-two",
        "arrow"
      ],
      "continuity": "nakata",
      "railLabel": "Four weeks after Ring; est. late 1997",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "storyGroup": "nakata:ring-two"
    },
    {
      "id": "mtwo",
      "title": "Ring 2 — MEIMU manga",
      "type": "Manga",
      "date": "Four-week sequel period; est. late 1997",
      "order": 1997.1,
      "canon": "Assumed canon",
      "release": "1999",
      "description": "The Nakata sequel adapted in manga.",
      "note": "Same central story position; adaptation-specific first-film recap does not require a new continuity.",
      "sourceIds": [
        "mtwo"
      ],
      "continuity": "nakata",
      "railLabel": "Four-week sequel period; est. late 1997",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/199999853041/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "nakata:ring-two"
    },
    {
      "id": "film-rasen",
      "title": "Spiral / Rasen (1998)",
      "type": "Film",
      "date": "Immediately after Ring’s Ryuji death; est. 1997",
      "order": 1997.05,
      "canon": "Confirmed canon",
      "release": "1998",
      "description": "Ando’s autopsy opens a resurrection story.",
      "note": "Distinct from Fuji’s 1999 teacher-led TV sequel. Does not coexist with Ring 2’s fate for Yoichi.",
      "sourceIds": [
        "film-rasen",
        "arrow"
      ],
      "continuity": "rasen",
      "railLabel": "Immediately after Ring’s Ryuji death; est. 1997",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "productName": "View official four-film collection",
      "productMatch": "Region A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.",
      "actionLabel": "View official four-film collection",
      "storyGroup": "rasen:rasen-film"
    },
    {
      "id": "mrasen",
      "title": "Spiral — Mizuki Sakura manga",
      "type": "Manga",
      "date": "After the film’s Ryuji death; est. late 1990s",
      "order": 1997.05,
      "canon": "Assumed canon",
      "release": "1999",
      "description": "Ando’s story in manga.",
      "note": "Creator calls this film adaptation. Do not assume prose continuity solely because credited to Suzuki. Differences / exact ending require panels.",
      "sourceIds": [
        "mrasen",
        "mrasen-author"
      ],
      "continuity": "rasen",
      "railLabel": "After the film’s Ryuji death; est. late 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/201274000088/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:rasen-film",
      "eraWindow": true
    },
    {
      "id": "3d",
      "title": "Sadako 3D",
      "type": "Film",
      "date": "Takanori’s adulthood; est. early 2010s",
      "order": 2012,
      "canon": "Assumed canon",
      "release": "2012",
      "description": "A schoolteacher confronts a lethal streamed video.",
      "note": "Screen interpretation of S-related material. Takanori links to Ando route, but no merger with Suzuki’s full Loop mechanics inferred.",
      "sourceIds": [
        "3d",
        "loop-s"
      ],
      "continuity": "rasen",
      "railLabel": "Takanori’s adulthood; est. early 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://cinemakadokawa.jp/product/entry-278.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d",
      "eraWindow": true
    },
    {
      "id": "3d2-birth",
      "title": "Sadako 3D2 — Nagi’s birth / early family history",
      "type": "Film segment",
      "date": "After Sadako 3D; before five-year-later main case",
      "order": 2012.5,
      "canon": "Confirmed canon",
      "release": "2013",
      "description": "Akane gives birth to Nagi.",
      "note": "Separate birth frame; first film’s release year and sequel’s release year do not yield a one-year story interval.",
      "sourceIds": [
        "3d2"
      ],
      "continuity": "rasen",
      "railLabel": "After Sadako 3D; before five-year-later main case",
      "segment": true,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/video1421/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "3d2",
      "storyGroup": "rasen:3d2-birth"
    },
    {
      "id": "3d2-main",
      "title": "Sadako 3D2 — Fuko / Nagi present",
      "type": "Film",
      "date": "Five years after Sadako 3D’s video incident",
      "order": 2017,
      "canon": "Confirmed canon",
      "release": "2013",
      "description": "Nagi’s aunt investigates renewed deaths.",
      "note": "Publisher-stated five-year interval. Numeric 2017 anchor extrapolates from estimated first-film era; it is not an independently verified calendar year.",
      "sourceIds": [
        "3d2"
      ],
      "continuity": "rasen",
      "railLabel": "Five years after Sadako 3D’s video incident",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/video1421/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d2-main"
    },
    {
      "id": "n3d",
      "title": "Sadako 3D: Resurrection — Fuji Dario",
      "type": "Novel",
      "date": "Earlier curse history → Takanori’s adulthood; est. early 2010s",
      "order": 2012,
      "canon": "Assumed canon",
      "release": "2012",
      "description": "Official film-story adaptation.",
      "note": "Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.",
      "sourceIds": [
        "n3d"
      ],
      "continuity": "rasen",
      "railLabel": "Earlier curse history → Takanori’s adulthood; est. early 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://store.kadokawa.co.jp/shop/series/series00154001?sort=sp&style=I",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d",
      "eraWindow": true
    },
    {
      "id": "m3d",
      "title": "Sadako — MEIMU (3D film manga)",
      "type": "Manga",
      "date": "Takanori’s adulthood; est. early 2010s",
      "order": 2012,
      "canon": "Assumed canon",
      "release": "2012",
      "description": "Official film-story adaptation.",
      "note": "Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.",
      "sourceIds": [
        "m3d"
      ],
      "continuity": "rasen",
      "railLabel": "Takanori’s adulthood; est. early 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://group.kadokawa.co.jp/documents/ir/library/pdf_k/report/585.pdf",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d",
      "eraWindow": true
    },
    {
      "id": "n3d2",
      "title": "Sadako 3D2: Rebirth — Riu Goto",
      "type": "Novel",
      "date": "Nagi’s birth → five-year-later case",
      "order": 2012.5,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "Official film-story adaptation.",
      "note": "Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.",
      "sourceIds": [
        "n3d2"
      ],
      "continuity": "rasen",
      "railLabel": "Nagi’s birth → five-year-later case",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/321301000283/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d2-birth",
      "eraWindow": true
    },
    {
      "id": "m3d2",
      "title": "Sadako 3D2 — Usagi Yuki manga",
      "type": "Manga",
      "date": "Five years after first online-video incident",
      "order": 2017,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "Official film-story adaptation.",
      "note": "Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.",
      "sourceIds": [
        "m3d2"
      ],
      "continuity": "rasen",
      "railLabel": "Five years after first online-video incident",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/321305000389/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:3d2-main",
      "eraWindow": true
    },
    {
      "id": "sadako19-fire",
      "title": "Sadako (2019) — apartment fire / girl’s earlier life",
      "type": "Film segment",
      "date": "One week before Mayu’s hospital case; earlier childhood embedded",
      "order": 2019,
      "canon": "Assumed canon",
      "release": "2019",
      "description": "The child survives an apartment fire.",
      "note": "Official synopsis’s one-week interval is a real clock; earlier upbringing not dated from 2019 release.",
      "sourceIds": [
        "sadako19"
      ],
      "continuity": "nakata",
      "railLabel": "One week before Mayu’s hospital case; earlier childhood embedded",
      "segment": true,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://cinemakadokawa.jp/product/entry-112.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "sadako19"
    },
    {
      "id": "sadako19",
      "title": "Sadako (2019) — Mayu / Kazuma / Masami",
      "type": "Film",
      "date": "Over twenty years after the earlier curse; est. late 2010s",
      "order": 2019,
      "canon": "Confirmed canon",
      "release": "2019",
      "description": "A counselor and online filmmaker encounter Sadako.",
      "note": "Returning Masami supports Nakata route. Tide is a source credit, not proof identical people / chronology. Mayu is 24 in junior publisher synopsis.",
      "sourceIds": [
        "sadako19",
        "sadako19-link",
        "n19",
        "n19j"
      ],
      "continuity": "nakata",
      "railLabel": "Over twenty years after the earlier curse; est. late 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://cinemakadokawa.jp/product/entry-112.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "nakata:sadako19",
      "eraWindow": true
    },
    {
      "id": "n19",
      "title": "Sadako — Osamu Makino novel",
      "type": "Novel",
      "date": "Over twenty years after earlier curse; est. late 2010s",
      "order": 2019,
      "canon": "Assumed canon",
      "release": "2019",
      "description": "Official adaptation of the 2019 film.",
      "note": "Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.",
      "sourceIds": [
        "n19"
      ],
      "continuity": "nakata",
      "railLabel": "Over twenty years after earlier curse; est. late 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/321810000192/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "nakata:sadako19",
      "eraWindow": true
    },
    {
      "id": "n19j",
      "title": "Sadako — Yukiko Yamamuro junior novel",
      "type": "Novel",
      "date": "Over twenty years after earlier curse; est. late 2010s",
      "order": 2019,
      "canon": "Assumed canon",
      "release": "2019",
      "description": "Official adaptation of the 2019 film.",
      "note": "Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.",
      "sourceIds": [
        "n19j"
      ],
      "continuity": "nakata",
      "railLabel": "Over twenty years after earlier curse; est. late 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://tsubasabunko.jp/product/321812000250.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "nakata:sadako19",
      "eraWindow": true
    },
    {
      "id": "m19",
      "title": "Sadako — BLZ manga",
      "type": "Manga",
      "date": "Over twenty years after earlier curse; est. late 2010s",
      "order": 2019,
      "canon": "Assumed canon",
      "release": "2019",
      "description": "Official adaptation of the 2019 film.",
      "note": "Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.",
      "sourceIds": [
        "m19"
      ],
      "continuity": "nakata",
      "railLabel": "Over twenty years after earlier curse; est. late 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.kadokawa.co.jp/product/321902000673/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "nakata:sadako19",
      "eraWindow": true
    },
    {
      "id": "kazuma-extras",
      "title": "Sadako — unpublished Fantastic Kazuma videos (disc extras)",
      "type": "Short video extras",
      "date": "est. 2010s; During Kazuma’s online-video career; before disappearance",
      "order": 2018.9,
      "canon": "Assumed canon",
      "release": "2019",
      "description": "Additional in-character video material.",
      "note": "Publisher edition lists previously unreleased Kazuma videos. Original extra titles / contents not viewed; may duplicate film snippets, so distinct-story count provisional. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "sadako19"
      ],
      "continuity": "nakata",
      "railLabel": "est. 2010s",
      "segment": false,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://cinemakadokawa.jp/product/entry-112.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "dx-film",
      "title": "Sadako DX",
      "type": "Film",
      "date": "Reiwa era: 2019 onward",
      "order": 2022,
      "canon": "Assumed canon",
      "release": "2022",
      "description": "A rationalist investigates a 24-hour curse.",
      "note": "Keep broad publisher-supported era. Reported Spiral-route connection / character identity still needs original verification; no new branch solely for this uncertainty.",
      "sourceIds": [
        "dx",
        "dx-film"
      ],
      "continuity": "rasen",
      "railLabel": "Reiwa era: 2019 onward",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://movies.kadokawa.co.jp/sadako-movie/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:dx",
      "eraWindow": true
    },
    {
      "id": "dx-novel",
      "title": "Sadako DX — Osamu Makino novel",
      "type": "Novel",
      "date": "Reiwa era: 2019 onward",
      "order": 2022,
      "canon": "Assumed canon",
      "release": "2022",
      "description": "Expanded prose version of the DX case.",
      "note": "Publisher explicitly promises film-omitted episodes. Full text required for earlier side stories; same present position as film.",
      "sourceIds": [
        "dx"
      ],
      "continuity": "rasen",
      "railLabel": "Reiwa era: 2019 onward",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/322203001824/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "rasen:dx",
      "eraWindow": true
    },
    {
      "id": "tv95",
      "title": "Ring / Ring: Kanzenban",
      "type": "TV film",
      "date": "Contemporary videotape era; est. 1990s",
      "order": 1990,
      "canon": "Confirmed canon",
      "release": "1995",
      "description": "Kazuyuki’s television-film investigation.",
      "note": "Broadcast and uncensored / expanded home version grouped. Different adaptation from 1999 serial. Exact story year and cut additions uninspected.",
      "sourceIds": [
        "tv95"
      ],
      "continuity": "tv95",
      "railLabel": "Contemporary videotape era; est. 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://en.wikipedia.org/wiki/Ring_(1995_film)",
      "productName": "View television-edition research",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View television-edition research",
      "eraWindow": true
    },
    {
      "id": "tv-final",
      "title": "Ring: The Final Chapter — episodes 1–12",
      "type": "TV serial",
      "date": "Contemporary 13-day curse case; est. late 1990s",
      "order": 1999,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Asakawa and Takayama investigate the tape.",
      "note": "Continuous main serial grouped, not twelve separate release-date entries. Earlier Sadako history remains embedded pending caption / episode inspection.",
      "sourceIds": [
        "tv99",
        "tv99-episodes"
      ],
      "continuity": "tv99",
      "railLabel": "Contemporary 13-day curse case; est. late 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.fujitv.co.jp/b_hp/ring/story10_12.html",
      "productName": "Read broadcaster episode archive",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "Read broadcaster episode archive",
      "eraWindow": true
    },
    {
      "id": "tv-rasen",
      "title": "Rasen — episodes 1–13",
      "type": "TV serial",
      "date": "Three months after The Final Chapter",
      "order": 1999.25,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Teacher Ando confronts a new threat.",
      "note": "Broadcaster’s thirteen-day rules and teacher protagonist distinguish this version from the autopsy film / novel.",
      "sourceIds": [
        "tv99",
        "tv99-time"
      ],
      "continuity": "tv99",
      "railLabel": "Three months after The Final Chapter",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.fujitv.co.jp/b_hp/rasen/index.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "korea",
      "title": "The Ring Virus / 링",
      "type": "Film",
      "date": "Contemporary pager / videotape era; est. 1990s",
      "order": 1999,
      "canon": "Confirmed canon",
      "release": "1999",
      "description": "Sun-ju investigates a fatal tape.",
      "note": "Official remake; Eun-suh’s earlier history differs from Japanese film. Original Korean story clock not inferred from June 1999 release.",
      "sourceIds": [
        "korea",
        "korea-review"
      ],
      "continuity": "korea",
      "railLabel": "Contemporary pager / videotape era; est. 1990s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.koreafilm.co.kr/database/movie/ring_virus/ring_virus.htm",
      "productName": "View Korean edition / production research",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View Korean edition / production research",
      "eraWindow": true
    },
    {
      "id": "us-past",
      "title": "The Ring / The Ring Two / Rings — Samara’s earlier life",
      "type": "Film backstory",
      "date": "est. late twentieth century; Decades before Rachel’s videotape investigation",
      "order": 1970,
      "canon": "Confirmed canon",
      "release": "2002–2017",
      "description": "Samara’s birth, adoption and well history.",
      "note": "Backstory is progressively disclosed by the three features; exact dates / conflicting recollections need original comparison. Avoid importing Sadako’s adult theater biography. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "us",
        "us2",
        "us17-plot"
      ],
      "continuity": "samara",
      "railLabel": "est. late twentieth century",
      "segment": true,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.paramount.com/movies/the-ring",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true,
      "container": true
    },
    {
      "id": "us-main",
      "title": "The Ring (2002)",
      "type": "Film",
      "date": "Rachel’s videotape case; est. early 2000s",
      "order": 2002,
      "canon": "Confirmed canon",
      "release": "2002",
      "description": "Rachel tries to save Aidan and Noah.",
      "note": "Main American remake. Seven-day interval is established; calendar year remains qualified pending props.",
      "sourceIds": [
        "us"
      ],
      "continuity": "samara",
      "railLabel": "Rachel’s videotape case; est. early 2000s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.paramount.com/movies/the-ring",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "us-short",
      "title": "Rings (2005 short film)",
      "type": "Short film",
      "date": "After The Ring; final seven days before The Ring Two opening",
      "order": 2002.4,
      "canon": "Confirmed canon",
      "release": "2005",
      "description": "Jake records his encounter with the tape.",
      "note": "Sixteen-minute narrative bridges the two films; not the 2017 feature. Exact DVD record supplied, not promise a current digital listing includes it.",
      "sourceIds": [
        "us-short",
        "us-short-plot"
      ],
      "continuity": "samara",
      "railLabel": "After The Ring; final seven days before The Ring Two opening",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.blu-ray.com/dvd/Rings-DVD/136569/",
      "productName": "View exact short-film DVD research",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View exact short-film DVD research"
    },
    {
      "id": "us-two",
      "title": "The Ring Two",
      "type": "Film",
      "date": "Six months after The Ring",
      "order": 2002.5,
      "canon": "Confirmed canon",
      "release": "2005",
      "description": "Rachel and Aidan face Samara again.",
      "note": "2005 release is not a three-year story jump. Birth / institutional history belongs in earlier backstory.",
      "sourceIds": [
        "us2"
      ],
      "continuity": "samara",
      "railLabel": "Six months after The Ring",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.zee5.com/movies/details/the-ring-two/0-0-1z5769132",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access"
    },
    {
      "id": "us17-plane",
      "title": "Rings (2017) — airplane / recovered videotape prologue",
      "type": "Film segment",
      "date": "est. 2000s–2010s; Years after Rachel’s case; before Julia’s investigation",
      "order": 2013,
      "canon": "Assumed canon",
      "release": "2017",
      "description": "A later tape chain reaches an airplane.",
      "note": "Plane and later Gabriel discovery / Julia story separated at elapsed jump; exact prologue year still unverified. Rail carries a broad era from the connected story / character generation, not a newly verified year prop.",
      "sourceIds": [
        "us17-plot"
      ],
      "continuity": "samara",
      "railLabel": "est. 2000s–2010s",
      "segment": true,
      "confidence": "Evidence-based broad era",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://www.paramount.com/movies/rings",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "us17"
    },
    {
      "id": "us17-main",
      "title": "Rings (2017) — Gabriel / Julia / Holt",
      "type": "Film",
      "date": "Two years after airplane prologue; digital-video era",
      "order": 2015,
      "canon": "Assumed canon",
      "release": "2017",
      "description": "Students experiment with Samara’s tape.",
      "note": "2017 is release date. No demonstrated contradiction requiring separate American continuity just because The Ring Two is not mentioned.",
      "sourceIds": [
        "us17",
        "us17-plot"
      ],
      "continuity": "samara",
      "railLabel": "Two years after airplane prologue; digital-video era",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.paramount.com/movies/rings",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": false,
      "workId": "us17"
    },
    {
      "id": "little",
      "title": "Little Ring I: Letter from the Dead",
      "type": "Novel",
      "date": "Contemporary school era; chain-letter legend nearly fifty years old",
      "order": 2010,
      "canon": "Assumed canon",
      "release": "2010",
      "description": "Yū receives an ominous chain letter.",
      "note": "Original licensed juvenile story. Included as assumed connected fiction; no verified exact bridge to Asakawa / Takanori and no invented second volume.",
      "sourceIds": [
        "little"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary school era; chain-letter legend nearly fifty years old",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/200912000625/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "kaidan-prologue",
      "title": "Sadako Kaidan — Prologue — Sho Tomono",
      "type": "Prose short",
      "date": "Contemporary school era; exact inter-story dates unverified",
      "order": 2010,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "An original Suzuki-supervised school horror story.",
      "note": "Creator contents verified. School-set stories need complete text to establish whether prologue is separate frame and how cases overlap; no publication-year chronology invented.",
      "sourceIds": [
        "kaidan",
        "kaidan-book"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary school era; exact inter-story dates unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://yomeruba.com/product/bunko/tsubasa/321303000274.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "kaidan-real",
      "title": "Sadako Kaidan — But I Am the Real One / だけどわたしは本物だから — Sho Tomono",
      "type": "Prose short",
      "date": "Contemporary school era; exact inter-story dates unverified",
      "order": 2010,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "An original Suzuki-supervised school horror story.",
      "note": "Creator contents verified. School-set stories need complete text to establish whether prologue is separate frame and how cases overlap; no publication-year chronology invented.",
      "sourceIds": [
        "kaidan",
        "kaidan-book"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary school era; exact inter-story dates unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://yomeruba.com/product/bunko/tsubasa/321303000274.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "kaidan-shutter",
      "title": "Sadako Kaidan — Shutter Chance / シャッターチャンス — Yuki Oi",
      "type": "Prose short",
      "date": "Contemporary school era; exact inter-story dates unverified",
      "order": 2010,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "An original Suzuki-supervised school horror story.",
      "note": "Creator contents verified. School-set stories need complete text to establish whether prologue is separate frame and how cases overlap; no publication-year chronology invented.",
      "sourceIds": [
        "kaidan",
        "kaidan-book"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary school era; exact inter-story dates unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://yomeruba.com/product/bunko/tsubasa/321303000274.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "kaidan-melody",
      "title": "Sadako Kaidan — Cursed Melody / 呪われたメロディー — Tadaaki Kawahito",
      "type": "Prose short",
      "date": "Contemporary school era; exact inter-story dates unverified",
      "order": 2010,
      "canon": "Assumed canon",
      "release": "2013",
      "description": "An original Suzuki-supervised school horror story.",
      "note": "Creator contents verified. School-set stories need complete text to establish whether prologue is separate frame and how cases overlap; no publication-year chronology invented.",
      "sourceIds": [
        "kaidan",
        "kaidan-book"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary school era; exact inter-story dates unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://yomeruba.com/product/bunko/tsubasa/321303000274.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "anthology-onair",
      "title": "the Ring: Four More Frightening Stories — ON AIR — Yuji Kobayashi",
      "type": "Scenario / prose story",
      "date": "Videotape era; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1998",
      "description": "An original published Ring-premise scenario.",
      "note": "Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.",
      "sourceIds": [
        "anthology"
      ],
      "continuity": "connected",
      "railLabel": "Videotape era; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://ci.nii.ac.jp/ncid/BA39877375?l=en",
      "productName": "View corresponding anthology / library access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding anthology / library access",
      "eraWindow": true
    },
    {
      "id": "anthology-well",
      "title": "the Ring: Four More Frightening Stories — Well / 井戸 — Yoshinobu Fujioka",
      "type": "Scenario / prose story",
      "date": "Videotape era; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1998",
      "description": "An original published Ring-premise scenario.",
      "note": "Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.",
      "sourceIds": [
        "anthology"
      ],
      "continuity": "connected",
      "railLabel": "Videotape era; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://ci.nii.ac.jp/ncid/BA39877375?l=en",
      "productName": "View corresponding anthology / library access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding anthology / library access",
      "eraWindow": true
    },
    {
      "id": "anthology-watch",
      "title": "the Ring: Four More Frightening Stories — Someone Is Watching / 誰かが見ている — Yutaka Ogura",
      "type": "Scenario / prose story",
      "date": "Videotape era; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1998",
      "description": "An original published Ring-premise scenario.",
      "note": "Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.",
      "sourceIds": [
        "anthology"
      ],
      "continuity": "connected",
      "railLabel": "Videotape era; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://ci.nii.ac.jp/ncid/BA39877375?l=en",
      "productName": "View corresponding anthology / library access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding anthology / library access",
      "eraWindow": true
    },
    {
      "id": "anthology-loop",
      "title": "the Ring: Four More Frightening Stories — Loop of the Ring — Takaharu Okita / Manabu Teshigawara",
      "type": "Scenario / prose story",
      "date": "Videotape era; est. late twentieth century",
      "order": 1990,
      "canon": "Assumed canon",
      "release": "1998",
      "description": "An original published Ring-premise scenario.",
      "note": "Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.",
      "sourceIds": [
        "anthology"
      ],
      "continuity": "connected",
      "railLabel": "Videotape era; est. late twentieth century",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://ci.nii.ac.jp/ncid/BA39877375?l=en",
      "productName": "View corresponding anthology / library access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding anthology / library access",
      "eraWindow": true
    },
    {
      "id": "ub25",
      "title": "Ubiquitous — 2025 collected rewrite",
      "type": "Novel",
      "date": "Contemporary era; includes a case fifteen years earlier",
      "order": 2020,
      "canon": "Disputed canon",
      "release": "2025",
      "description": "Maezawa and Tsuyuki investigate unexplained deaths.",
      "note": "2025 publisher describes a new work; earlier serial / 2024 project testimony suggests a different version. Preserve as disputed connected variant pending original comparison, not automatically seventh collected Ring novel.",
      "sourceIds": [
        "ub25",
        "ub-author",
        "ub-variants"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary era; includes a case fifteen years earlier",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/322411000029/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "neighbor",
      "title": "My Neighbor Sadako-chan 2D",
      "type": "Manga",
      "date": "Modern apartment-life era",
      "order": 2012,
      "canon": "Non-canon connected",
      "release": "2013",
      "description": "Licensed comedy reimagining.",
      "note": "Official Sadako 3D gag spin-off; substantially different premise warrants a reimagining shelf. Continuous volume grouped; no chapter time jumps verified.",
      "sourceIds": [
        "comedy2d"
      ],
      "continuity": "connected",
      "railLabel": "Modern apartment-life era",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/301305003930/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "san",
      "title": "Sadako-san and Sadako-chan",
      "type": "Manga",
      "date": "Modern online-video era; alongside 2019-film premise",
      "order": 2019,
      "canon": "Non-canon connected",
      "release": "2019 / English 2021",
      "description": "Licensed comedy reimagining.",
      "note": "Official 2019-film comedy; lighter tone alone does not prove it follows horror-film ending. Continuous volume grouped; no chapter time jumps verified.",
      "sourceIds": [
        "comedy19"
      ],
      "continuity": "connected",
      "railLabel": "Modern online-video era; alongside 2019-film premise",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://sevenseasentertainment.com/series/sadako-san-and-sadako-chan/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "end",
      "title": "Doomsday Sadako / 終末の貞子さん",
      "type": "Manga",
      "date": "Post-apocalyptic era; interval from core films unverified",
      "order": 2100,
      "canon": "Non-canon connected",
      "release": "2019",
      "description": "Licensed comedy reimagining.",
      "note": "Official parody spin-off; no calendar 2100 asserted from numeric anchor. Continuous volume grouped; no chapter time jumps verified.",
      "sourceIds": [
        "comedy-end"
      ],
      "continuity": "connected",
      "railLabel": "Post-apocalyptic era; interval from core films unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/topics/3087/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "dc",
      "title": "Ring / The Ring: Terror’s Realm",
      "type": "Game",
      "date": "Contemporary CDC / computer-simulation era; exact year unverified",
      "order": 2000,
      "canon": "Non-canon connected",
      "release": "2000",
      "description": "Meg investigates deaths at the CDC.",
      "note": "Japanese and localized versions are the same released game. Borrowed Loop ideas do not prove prose-world sequel status; no release-year setting inferred.",
      "sourceIds": [
        "dc",
        "dc-plot"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary CDC / computer-simulation era; exact year unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.sega.jp/history/hard/dreamcast/software_l.html",
      "productName": "View official licensed-game inventory",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View official licensed-game inventory",
      "eraWindow": true
    },
    {
      "id": "ws",
      "title": "Ring ∞ / Ring Infinity — base scenarios / endings",
      "type": "Game",
      "date": "Contemporary videotape era; exact year unverified",
      "order": 2000,
      "canon": "Assumed canon",
      "release": "2000",
      "description": "Original portable text-adventure scenario.",
      "note": "Original manual inventoried. Branching endings grouped; retired WonderGate downloads need separate publication / scenario inventory. Japanese chronology governs localization claims.",
      "sourceIds": [
        "ws"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary videotape era; exact year unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://gamemanual.midnightmeattrain.com/entry/%E3%83%AA%E3%83%B3%E3%82%B0%E2%88%9E",
      "productName": "View original manual / edition research",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View original manual / edition research",
      "eraWindow": true
    },
    {
      "id": "mobile-past",
      "title": "Sadako M — school deaths / Iwai investigation",
      "type": "Game segment",
      "date": "Three years before detective-agency present",
      "order": 2018,
      "canon": "Assumed canon",
      "release": "2021",
      "description": "A school death case remains unresolved.",
      "note": "Developer explicitly states three-year interval; numeric 2018 is not verified fictional year.",
      "sourceIds": [
        "mobile"
      ],
      "continuity": "connected",
      "railLabel": "Three years before detective-agency present",
      "segment": true,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.nowpro.co.jp/result/game/2742/index.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": true,
      "workId": "mobile"
    },
    {
      "id": "mobile-main",
      "title": "Sadako M: Unsolved Case Detective Agency — published campaign",
      "type": "Game",
      "date": "Three years after school case; investigator disappears",
      "order": 2021,
      "canon": "Assumed canon",
      "release": "2021",
      "description": "Assistants pursue a missing investigator’s cases.",
      "note": "Developer premise read. Complete chapter / update endings and retired-service access not recovered; no invented final resolution.",
      "sourceIds": [
        "mobile"
      ],
      "continuity": "connected",
      "railLabel": "Three years after school case; investigator disappears",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.nowpro.co.jp/result/game/2742/index.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "container": false,
      "workId": "mobile"
    },
    {
      "id": "dbd",
      "title": "Dead by Daylight: Sadako Rising — Sadako / adult Yoichi lore",
      "type": "Game story",
      "date": "Yoichi’s adulthood; decades after Ring / Ring 2; Fog calendar unverified",
      "order": 2020,
      "canon": "Non-canon connected",
      "release": "2022",
      "description": "Adult Yoichi investigates disappearances.",
      "note": "Licensed continuation drawing on Japanese films; Entity realm is a crossover, not proof all film / novel versions coexist. Later licensed archive stories need a complete Tome inventory.",
      "sourceIds": [
        "dbd",
        "dbd-lore"
      ],
      "continuity": "nakata",
      "railLabel": "Yoichi’s adulthood; decades after Ring / Ring 2; Fog calendar unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://blog.playstation.com/?p=361852",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "cross-film",
      "title": "Sadako vs. Kayako",
      "type": "Film",
      "date": "Modern digital-video era; est. 2010s",
      "order": 2016,
      "canon": "Non-canon connected",
      "release": "2016",
      "description": "Yūri and Suzuka face converging curses.",
      "note": "Two-day rule and altered curse-house circumstances distinguish crossover history from main films.",
      "sourceIds": [
        "cross"
      ],
      "continuity": "crossover",
      "railLabel": "Modern digital-video era; est. 2010s",
      "segment": false,
      "confidence": "Evidence-based estimate",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": true,
      "productUrl": "https://cinemakadokawa.jp/product/entry-180.html",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "crossover:cross-film",
      "eraWindow": true,
      "sharedWork": "sadako-kayako-film"
    },
    {
      "id": "cross-jr",
      "title": "Sadako vs. Kayako — Kiyoshi Yamamoto junior novel",
      "type": "Novel",
      "date": "Modern era; same Yūri / Suzuka film case",
      "order": 2016,
      "canon": "Assumed canon",
      "release": "2016",
      "description": "Junior adaptation of the crossover film.",
      "note": "Shogakukan Junior Bunko, not Tsubasa. Same-story position; do not confuse with Kuro Shiro’s original adult novel.",
      "sourceIds": [
        "cross-jr",
        "cross"
      ],
      "continuity": "crossover",
      "railLabel": "Modern era; same Yūri / Suzuka film case",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.ehonnavi.net/ehon00.asp?no=112087&pcf=1",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "storyGroup": "crossover:cross-film",
      "eraWindow": true,
      "sharedWork": "sadako-kayako-junior"
    },
    {
      "id": "cross-original",
      "title": "Sadako vs. Kayako — Kuro Shiro ORIGINAL novel",
      "type": "Novel",
      "date": "Modern documentary-video era; relation to film case unverified",
      "order": 2016,
      "canon": "Assumed canon",
      "release": "2016",
      "description": "Keiko and Kosakai film a confrontation of curses.",
      "note": "Publisher explicitly labels original story with different cast. Separate narrative beside film-era window, not falsely merged as its adaptation. No proof of incompatible total history beyond altered case.",
      "sourceIds": [
        "cross-original"
      ],
      "continuity": "crossover",
      "railLabel": "Modern documentary-video era; relation to film case unverified",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.kadokawa.co.jp/product/321601000172/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true,
      "sharedWork": "sadako-kayako-original"
    },
    {
      "id": "escape",
      "title": "SADAKO and the Cursed Video — SCRAP / Gomi live story",
      "type": "Live escape game",
      "date": "Contemporary era; thirty minutes before curse activates",
      "order": 2023,
      "canon": "Non-canon connected",
      "release": "2023",
      "description": "Participants seek an escape from the tape.",
      "note": "Original licensed interactive scenario; altered countdown / participatory variants qualified. Historical event page does not confirm current ticket availability.",
      "sourceIds": [
        "escape"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary era; thirty minutes before curse activates",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://mysterycircus.jp/s/sadako/en/",
      "productName": "View corresponding edition / access",
      "productMatch": "Corresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.",
      "actionLabel": "View corresponding edition / access",
      "eraWindow": true
    },
    {
      "id": "well-channel",
      "title": "Sadako’s Well Life / 貞子の井戸暮らし — in-character web series",
      "type": "Web shorts",
      "date": "Contemporary actress-Sadako persona; early 2020s",
      "order": 2022,
      "canon": "Promotional only",
      "release": "2022–2023",
      "description": "Sadako plays an actress living everyday life.",
      "note": "Official production-company testimony verifies channel. Promotional daily-life persona is not a main-film sequel; individual plotted sketches / puzzle special still need eligible-story inventory.",
      "sourceIds": [
        "well-channel",
        "well-video"
      ],
      "continuity": "connected",
      "railLabel": "Contemporary actress-Sadako persona; early 2020s",
      "segment": false,
      "confidence": "Relative / stated chronology",
      "inspection": "Source / inventory checked; full work not inspected",
      "estimated": false,
      "productUrl": "https://www.youtube.com/channel/UCB5xmjuQIKGP6JpDoEW4rQQ",
      "productName": "Watch official web series",
      "productMatch": "Exact channel linked by its production company; archive availability varies.",
      "actionLabel": "Watch official web series",
      "eraWindow": true
    }
  ],
  "sources": [
    {
      "id": "ring",
      "title": "Kadokawa — Ring novel",
      "url": "https://www.kadokawa.co.jp/product/199999188001/",
      "kind": "Primary",
      "note": "Original Japanese prose edition and premise. Linked BookWalker legal sample attempted October 27; reader inaccessible to web parser. Not a full interior inspection."
    },
    {
      "id": "spiral",
      "title": "Kadokawa — Spiral novel",
      "url": "https://www.kadokawa.co.jp/product/199999188003/",
      "kind": "Primary",
      "note": "Ando autopsy / Ring-virus premise; 1997 paperback is not the original 1995 publication or fictional date."
    },
    {
      "id": "loop-s",
      "title": "PRH / Vertical — Loop and S",
      "url": "https://www.penguinrandomhouse.com/series/RTG/ring-hardcover/",
      "kind": "Primary",
      "note": "Official descriptions: Loop stands apart in the same story world; S follows adult Takanori, son of Spiral’s Mitsuo."
    },
    {
      "id": "birthday",
      "title": "PRH / Vertical — Birthday",
      "url": "https://www.penguinrandomhouse.com/books/175549/birthday-by-koji-suzuki/",
      "kind": "Primary",
      "note": "Publisher describes Sadako’s theater past, Mai after Ryuji’s death and Reiko after Kaoru’s disappearance. Three stories, not one post-Loop episode."
    },
    {
      "id": "tide",
      "title": "Kadokawa — Tide",
      "url": "https://www.kadokawa.co.jp/product/321511000305",
      "kind": "Primary",
      "note": "Kashiwada retains memories of Takayama and Futami. Same-series list verifies all six collected books."
    },
    {
      "id": "tide-first",
      "title": "Kadokawa — 2013 Tide first edition",
      "url": "https://www.kadokawa.co.jp/product/321301000273/",
      "kind": "Primary",
      "note": "Publisher text points to Shizuko’s history. User reviews are not publisher assertions of exact chronology."
    },
    {
      "id": "prose-history",
      "title": "Suzuki prose — scholarly publication inventory",
      "url": "https://www.iisr.jp/journal/journal2024/P247-P269.pdf",
      "kind": "Secondary / scholarly bibliography",
      "note": "Academic paper read for first-edition and ancillary publication inventory, including 1998 scenario anthology."
    },
    {
      "id": "prose-date",
      "title": "Ring original — Japanese critical reading",
      "url": "https://odamitsuo.hatenablog.com/entry/20131118/1384700434",
      "kind": "Secondary / book criticism",
      "note": "Reader specifically notes no opening calendar year; September 5 deaths and theater past about 25 years earlier. Do not override with unverified English year labels."
    },
    {
      "id": "ub-author",
      "title": "Suzuki interview — Ubiquitous",
      "url": "https://note.com/elites/n/ne63696e0e51f",
      "kind": "Primary",
      "note": "2024 author interview / editorial note calls work in progress a continuation from S / Tide."
    },
    {
      "id": "ub-serial",
      "title": "Kadobun — Ubiquitous final serial installment",
      "url": "https://kadobun.jp/news/info/20.html",
      "kind": "Primary",
      "note": "Publisher June 10 2017 announcement lists Ubiquitous as final installment in July issue. Actual serialized narrative was published; not an entirely unreleased project."
    },
    {
      "id": "ub25",
      "title": "Kadokawa — Ubiquitous (2025)",
      "url": "https://www.kadokawa.co.jp/product/322411000029/",
      "kind": "Primary",
      "note": "New 440-page publication with Maezawa / Tsuyuki premise; promoted as complete new work. Relation to earlier serial requires original comparison."
    },
    {
      "id": "ub-variants",
      "title": "Ubiquitous serial / collected-version comparison",
      "url": "https://note.com/prime_emu8001/n/ne0e7519cb1b4",
      "kind": "Secondary / comparative reader account",
      "note": "Reader reports earlier Ryuji / Loop serial differs from 2025 rewrite. Used only to flag comparison, not to certify precise canon."
    },
    {
      "id": "arrow",
      "title": "Arrow — Ringu Collection",
      "url": "https://www.arrowvideo.com/p/ringu-collection-blu-ray/12946832/",
      "kind": "Primary",
      "note": "Official Region A set contains Ring, Spiral, Ring 2 and Ring 0. Distinguishes lost first sequel from Nakata’s sequel."
    },
    {
      "id": "film-ring",
      "title": "Ring (1998) — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Ring_(film)",
      "kind": "Secondary / film synopsis",
      "note": "Reiko / Ryuji / Yoichi route and decades-earlier psychic history. Exact story-year claims remain qualified."
    },
    {
      "id": "film-rasen",
      "title": "Spiral (1998) — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Spiral_(1998_film)",
      "kind": "Secondary / film synopsis",
      "note": "Alternative sequel’s resurrection / Ando plot cannot coexist with Ring 2’s surviving Yoichi route."
    },
    {
      "id": "film-two",
      "title": "Ring 2 — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Ring_2",
      "kind": "Secondary / film synopsis",
      "note": "Four-week interval after original film; older body / well-survival reveal differs from prose."
    },
    {
      "id": "film-zero",
      "title": "Ring 0: Birthday — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Ring_0:_Birthday",
      "kind": "Secondary / film synopsis",
      "note": "Theater-era adaptation of Lemonheart, with film-specific split-Sadako story."
    },
    {
      "id": "3d",
      "title": "Kadokawa Cinema — Sadako 3D",
      "url": "https://cinemakadokawa.jp/product/entry-278.html",
      "kind": "Primary",
      "note": "Original 2012 release and Akane / Takanori / Kashiwada premise. 2019 reissue must not become original release or setting."
    },
    {
      "id": "3d2",
      "title": "Kadokawa — Sadako 3D2",
      "url": "https://www.kadokawa.co.jp/product/video1421/",
      "kind": "Primary",
      "note": "Official synopsis explicitly says five years after the cursed online-video incident. Catalogue’s 2019 reissue field does not override 2013 original release."
    },
    {
      "id": "sadako19",
      "title": "Kadokawa Cinema — Sadako (2019)",
      "url": "https://cinemakadokawa.jp/product/entry-112.html",
      "kind": "Primary",
      "note": "Official film premise, Tide source credit and physical / digital editions. Credits returning Hitomi Sato; film route not equated to the very different Tide plot."
    },
    {
      "id": "sadako19-link",
      "title": "Sadako — returning Masami link",
      "url": "https://en.wikipedia.org/wiki/Sadako_(film)",
      "kind": "Secondary / film narrative inventory",
      "note": "Returning Ring / Ring 2 character connects Nakata’s 2019 film; named source novel alone does not move it into prose world."
    },
    {
      "id": "dx",
      "title": "Kadokawa — Sadako DX novel",
      "url": "https://www.kadokawa.co.jp/product/322203001824/",
      "kind": "Primary",
      "note": "Publisher explicitly states Reiwa era, 24-hour curse and additional episodes absent from film."
    },
    {
      "id": "dx-film",
      "title": "Sadako DX — film route cross-check",
      "url": "https://en.wikipedia.org/wiki/Sadako_DX",
      "kind": "Secondary / film inventory",
      "note": "Licensed new film; reported Spiral-route continuation remains qualified until original production testimony / complete film checked."
    },
    {
      "id": "dx-official",
      "title": "Kadokawa — Sadako DX official film site",
      "url": "https://movies.kadokawa.co.jp/sadako-movie/",
      "kind": "Primary",
      "note": "Official corresponding 2022 film site, identified by credited cast / publisher promotion; distinct from Makino novel."
    },
    {
      "id": "tv95",
      "title": "Ring 1995 — TV film inventory",
      "url": "https://en.wikipedia.org/wiki/Ring_(1995_film)",
      "kind": "Secondary / television inventory",
      "note": "Broadcast adaptation and Kanzenban home cut are the same core story."
    },
    {
      "id": "tv99",
      "title": "Fuji TV — Rasen",
      "url": "https://www.fujitv.co.jp/b_hp/rasen/index.html",
      "kind": "Primary",
      "note": "Broadcaster explicitly follows Final Chapter, uses thirteen-day curse and a 34-year-old teacher Ando."
    },
    {
      "id": "tv99-episodes",
      "title": "Fuji — Final Chapter final episodes",
      "url": "https://www.fujitv.co.jp/b_hp/ring/story10_12.html",
      "kind": "Primary",
      "note": "Official episode-synopsis archive found; legacy Shift-JIS text misdecoded in web parser. Not claimed fully read."
    },
    {
      "id": "tv99-time",
      "title": "Rasen TV — elapsed interval / episode count",
      "url": "https://www.allcinema.net/cinema/161046",
      "kind": "Secondary / television reference",
      "note": "13 episodes; main story three months after previous serial."
    },
    {
      "id": "korea",
      "title": "The Ring Virus — Korean production record",
      "url": "https://www.koreafilm.co.kr/database/movie/ring_virus/ring_virus.htm",
      "kind": "Industry / film catalogue",
      "note": "Production / cast / original Korean narrative synopsis read."
    },
    {
      "id": "korea-review",
      "title": "Darcy Paquet — The Ring Virus",
      "url": "https://stats.koreanfilm.org/kfilm99.html",
      "kind": "Secondary / specialist film criticism",
      "note": "Confirms official Japanese–Korean remake; Sun-ju / Eun-suh characters."
    },
    {
      "id": "us",
      "title": "Paramount — The Ring",
      "url": "https://www.paramount.com/movies/the-ring",
      "kind": "Primary",
      "note": "Official remake edition / access and Rachel / Aidan premise."
    },
    {
      "id": "us2",
      "title": "The Ring Two — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/The_Ring_Two",
      "kind": "Secondary / film synopsis",
      "note": "Six months after original; Samara’s mother history and present possession story."
    },
    {
      "id": "us2-access",
      "title": "Zee5 — The Ring Two licensed access",
      "url": "https://www.zee5.com/movies/details/the-ring-two/0-0-1z5769132",
      "kind": "Primary",
      "note": "Corresponding licensed film destination; region / rental restrictions vary."
    },
    {
      "id": "us-short",
      "title": "Rings (2005) — original DVD edition",
      "url": "https://www.blu-ray.com/dvd/Rings-DVD/136569/",
      "kind": "Secondary / physical-edition record",
      "note": "DreamWorks 16-minute short, not the 2017 feature."
    },
    {
      "id": "us-short-plot",
      "title": "Rings (2005) — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Rings_(2005_film)",
      "kind": "Secondary / short-film synopsis",
      "note": "Jake’s seven-day diary runs directly into The Ring Two opening."
    },
    {
      "id": "us17",
      "title": "Paramount — Rings (2017)",
      "url": "https://www.paramount.com/movies/rings",
      "kind": "Primary",
      "note": "Professor / students experiment narrative, digital access verified."
    },
    {
      "id": "us17-plot",
      "title": "Rings (2017) — narrative cross-check",
      "url": "https://en.wikipedia.org/wiki/Rings_(2017_film)",
      "kind": "Secondary / film synopsis",
      "note": "Earlier airplane / videotape discovery and later Julia inquiry separated. Does not establish incompatible alternate world solely by omitting Rachel."
    },
    {
      "id": "nagai",
      "title": "Kodansha — Ring by Kojiro Nagai",
      "url": "https://www.kodansha.co.jp/comic/products/0000033662",
      "kind": "Primary",
      "note": "1996 original manga adaptation, distinct from Inagaki’s film-script version."
    },
    {
      "id": "inagaki",
      "title": "Kadokawa — Ring: Curse combined manga",
      "url": "https://www.kadokawa.co.jp/product/200503000169/",
      "kind": "Primary",
      "note": "Inagaki / Takahashi / Suzuki source credits; 2005 collection not assumed a new story beyond original upper / lower volumes."
    },
    {
      "id": "mrasen",
      "title": "Kadokawa — Spiral manga",
      "url": "https://www.kadokawa.co.jp/product/201274000088/",
      "kind": "Primary",
      "note": "Mizuki Sakura; 1999 paper / 2013 ebook. Author calls it film comic adaptation in Wacom interview; original interior needed for precise divergence."
    },
    {
      "id": "mrasen-author",
      "title": "Mizuki Sakura — creator interview",
      "url": "https://tablet.wacom.co.jp/article/drawing-with-wacom151",
      "kind": "Primary",
      "note": "Creator identifies Spiral and Kuroyuri Danchi as film comic adaptations."
    },
    {
      "id": "mtwo",
      "title": "Kadokawa — Ring 2 manga",
      "url": "https://www.kadokawa.co.jp/product/199999853041/",
      "kind": "Primary",
      "note": "MEIMU; February 3 1999 original edition."
    },
    {
      "id": "mzero",
      "title": "Kadokawa — Ring 0 manga",
      "url": "https://www.kadokawa.co.jp/product/199999853172/",
      "kind": "Primary",
      "note": "MEIMU; January 28 2000, film-derived prequel adaptation."
    },
    {
      "id": "mbirthday",
      "title": "LINE Manga / Kadokawa — Birthday contents",
      "url": "https://manga.line.me/product/periodic?id=S131934",
      "kind": "Primary",
      "note": "Legal serialized edition explicitly lists Floating Coffin, Lemonheart and original SADAKO. Happy Birthday is not among manga contents."
    },
    {
      "id": "mdeath",
      "title": "Kadokawa — Ring: Death combined manga",
      "url": "https://www.kadokawa.co.jp/product/200503000170/",
      "kind": "Primary",
      "note": "512 pages / MEIMU; Mai investigates Ryuji. Contents need inspection before treating collection title as a wholly new sequel."
    },
    {
      "id": "m3d",
      "title": "Kadokawa shareholder report — 3D adaptations",
      "url": "https://group.kadokawa.co.jp/documents/ir/library/pdf_k/report/585.pdf",
      "kind": "Primary",
      "note": "Publisher lists S, Fuji Dario’s Resurrection novel and MEIMU’s Sadako comic as distinct related products."
    },
    {
      "id": "n3d",
      "title": "Kadokawa — film-related book catalogue",
      "url": "https://store.kadokawa.co.jp/shop/series/series00154001?sort=sp&style=I",
      "kind": "Primary",
      "note": "Official corresponding series catalogue includes Sadako 3D: Resurrection, July 2013 sequel novel, adult crossover and comedy."
    },
    {
      "id": "n3d2",
      "title": "Kadokawa — Sadako 3D2: Rebirth novel",
      "url": "https://www.kadokawa.co.jp/product/321301000283/",
      "kind": "Primary",
      "note": "Riu Goto, not Suzuki’s next original novel; film adaptation and birth frame."
    },
    {
      "id": "m3d2",
      "title": "Kadokawa — Sadako 3D2 manga",
      "url": "https://www.kadokawa.co.jp/product/321305000389/",
      "kind": "Primary",
      "note": "Usagi Yuki; 2013 film adaptation, not novel by Goto."
    },
    {
      "id": "n19",
      "title": "Kadokawa — Sadako adult novel",
      "url": "https://www.kadokawa.co.jp/product/321810000192/",
      "kind": "Primary",
      "note": "Osamu Makino; publisher explicitly says movie novelization with additional background and some differences."
    },
    {
      "id": "n19j",
      "title": "Tsubasa — Sadako junior novel",
      "url": "https://tsubasabunko.jp/product/321812000250.html",
      "kind": "Primary",
      "note": "Yukiko Yamamuro / Ryo Akizuki, not Makino edition; Mayu age 24; adaptation variants acknowledged."
    },
    {
      "id": "m19",
      "title": "Kadokawa — Sadako manga",
      "url": "https://www.kadokawa.co.jp/product/321902000673/",
      "kind": "Primary",
      "note": "BLZ / Suzuki / Sugihara; November 2019 movie adaptation."
    },
    {
      "id": "little",
      "title": "Kadokawa — Little Ring I: Letter from the Dead",
      "url": "https://www.kadokawa.co.jp/product/200912000625/",
      "kind": "Primary",
      "note": "Aki Mizuno original junior story with Suzuki credited for premise; title’s I does not prove additional volumes exist."
    },
    {
      "id": "kaidan",
      "title": "Group SNE — Sadako Kaidan creator interview / contents",
      "url": "https://www.groupsne.co.jp/user/interview/2013/06/01.html",
      "kind": "Primary",
      "note": "Creator page explicitly lists prologue and three stories by Tomono, Oi and Kawahito, and discusses original premises."
    },
    {
      "id": "kaidan-book",
      "title": "Kadokawa Yomeruba — Sadako Kaidan",
      "url": "https://yomeruba.com/product/bunko/tsubasa/321303000274.html",
      "kind": "Primary",
      "note": "Suzuki-supervised original school-story anthology; legal sample linked."
    },
    {
      "id": "anthology",
      "title": "CiNii — the Ring: Four More Frightening Stories",
      "url": "https://ci.nii.ac.jp/ncid/BA39877375?l=en",
      "kind": "Institutional bibliography",
      "note": "Institutional contents: ON AIR, Well, Someone Is Watching, Loop of the Ring. Kadokawa 1998 original scenario anthology."
    },
    {
      "id": "radio",
      "title": "Oricon — Kadokawa Drama Renaissance Ring",
      "url": "https://www.oricon.co.jp/prof/173939/products/206616/1/",
      "kind": "Industry / edition record",
      "note": "1996 three-CD drama, PSCR-5497/9, not merely score music."
    },
    {
      "id": "comedy2d",
      "title": "Kadokawa — My Neighbor Sadako-chan 2D",
      "url": "https://www.kadokawa.co.jp/product/301305003930/",
      "kind": "Primary",
      "note": "Yuji Ihara / Suzuki-supervised official 3D gag spin-off."
    },
    {
      "id": "comedy19",
      "title": "Seven Seas — Sadako-san and Sadako-chan",
      "url": "https://sevenseasentertainment.com/series/sadako-san-and-sadako-chan/",
      "kind": "Primary",
      "note": "Official English edition; 2019 movie copyright and modern-video premise."
    },
    {
      "id": "comedy-end",
      "title": "Kadokawa — Doomsday Sadako announcement",
      "url": "https://www.kadokawa.co.jp/topics/3087/",
      "kind": "Primary",
      "note": "Koma Natsumi’s official 2019 film parody spin-off; not ordinary film-future canon."
    },
    {
      "id": "dc",
      "title": "SEGA — Dreamcast licensed software list",
      "url": "https://www.sega.jp/history/hard/dreamcast/software_l.html",
      "kind": "Primary",
      "note": "Ring, Kadokawa / Asmik, February 24 2000, T-27902M."
    },
    {
      "id": "dc-plot",
      "title": "Dreamcast Ring — narrative / localization cross-check",
      "url": "https://consoledictionary.com/games/15698",
      "kind": "Secondary / game catalogue",
      "note": "Meg / CDC scenario; Japanese Ring and Terror’s Realm same game rather than two sequels."
    },
    {
      "id": "ws",
      "title": "Ring Infinity — original manual inventory",
      "url": "https://gamemanual.midnightmeattrain.com/entry/%E3%83%AA%E3%83%B3%E3%82%B0%E2%88%9E",
      "kind": "Original manual / third-party archive",
      "note": "Original game manual images hosted in preservation collection; original scenario and retired WonderGate service. Full images / game routes not inspected."
    },
    {
      "id": "mobile",
      "title": "Now Production — Sadako M",
      "url": "https://www.nowpro.co.jp/result/game/2742/index.html",
      "kind": "Primary",
      "note": "Developer story: school deaths, three years later detective disappears. Licensed mobile original; October 26 2021 release."
    },
    {
      "id": "dbd",
      "title": "Behaviour — Sadako Rising design account",
      "url": "https://blog.playstation.com/?p=361852",
      "kind": "Primary",
      "note": "Developer-authored account of licensed Sadako / adult Yoichi continuation."
    },
    {
      "id": "dbd-lore",
      "title": "Yoichi — published game lore transcription",
      "url": "https://deadbydaylight.wiki.gg/wiki/Yoichi",
      "kind": "Secondary / game-lore transcription",
      "note": "Adult university professor’s new case; official license holder allowed new lore. In-game text not directly loaded."
    },
    {
      "id": "cross",
      "title": "Kadokawa Cinema — Sadako vs. Kayako",
      "url": "https://cinemakadokawa.jp/product/entry-180.html",
      "kind": "Primary",
      "note": "Official two-day curse and Yūri / Suzuka / Keizo film story."
    },
    {
      "id": "cross-original",
      "title": "Kadokawa — Kuro Shiro adult crossover novel",
      "url": "https://www.kadokawa.co.jp/product/321601000172/",
      "kind": "Primary",
      "note": "Explicit ORIGINAL STORY: Keiko / Kosakai documentary crew. This is not the Yūri / Suzuka screenplay retold."
    },
    {
      "id": "cross-jr",
      "title": "Sadako vs. Kayako junior edition",
      "url": "https://www.ehonnavi.net/ehon00.asp?no=112087&pcf=1",
      "kind": "Retail / publisher-description reproduction",
      "note": "Kiyoshi Yamamoto / Shogakukan, ISBN 9784092308695. Film protagonists, distinct from adult original."
    },
    {
      "id": "escape",
      "title": "SCRAP — SADAKO and the Cursed Video",
      "url": "https://mysterycircus.jp/s/sadako/en/",
      "kind": "Primary",
      "note": "Official licensed live escape narrative, thirty-minute deadline. Historical event page, not promise tickets still available."
    },
    {
      "id": "well-channel",
      "title": "ASTRAY — official Sadako YouTube production",
      "url": "https://astray.info/works/",
      "kind": "Primary",
      "note": "Production company identifies official actress-Sadako slice-of-life channel and links actual channel."
    },
    {
      "id": "well-video",
      "title": "Official Sadako channel — DX retrospective",
      "url": "https://www.youtube.com/watch?v=Th-xJguJM58",
      "kind": "Primary",
      "note": "October 2022 official in-character video; recap is not another main-film sequel."
    },
    {
      "id": "pendant",
      "title": "Pendant of Mourning — producer announcement",
      "url": "https://www.atpress.ne.jp/news/390938",
      "kind": "Primary",
      "note": "2024 independent production announcement. No Kadokawa / Suzuki license proven; title similarity alone insufficient."
    }
  ],
  "scope": [
    {
      "title": "Ring: Curse / Ring: Death (2005 combined editions)",
      "type": "Manga collections",
      "status": "Collection / duplication review",
      "note": "Do not count as new originals on top of Inagaki, Sakura and MEIMU constituent works without contents comparison. Death’s 512 pages plausibly collect multiple prior stories; exact contents uninspected.",
      "sources": [
        "inagaki",
        "mdeath"
      ]
    },
    {
      "title": "Birthday / Lemonheart radio-drama adaptation",
      "type": "Audio drama",
      "status": "Edition identification pending",
      "note": "Reported 2000 audio adaptation must be distinguished from soundtrack / Yukie Nakama single. Exact authorized CD / broadcaster edition not recovered; not fabricated as a verified product.",
      "sources": [
        "birthday",
        "radio"
      ]
    },
    {
      "title": "Published screenplay books; alternate film cuts; prose audiobooks",
      "type": "Script / audio adaptations",
      "status": "Same-story formats; exact edition inventory open",
      "note": "1999 Ring / Ring 2 and 2000 Ring 0 screenplay books verified by scholarly bibliography. Additional script-only scenes need inspection; narrated text is not automatically new fictional events.",
      "sources": [
        "prose-history"
      ]
    },
    {
      "title": "The Grudge / Ring crossover games, pachinko, mobile attractions, USJ Sadako narratives",
      "type": "Licensed interactive media",
      "status": "Omission audit open",
      "note": "Licensed cosmetics and repeated footage are not automatically stories. Actual written campaigns / original attraction scripts need title-level check before exhaustive publication claim.",
      "sources": [
        "dbd",
        "escape"
      ]
    },
    {
      "title": "Sadako 3D2 Suma4D synchronized app",
      "type": "Companion app",
      "status": "No separate story inferred",
      "note": "Synchronized screen effects alone do not establish a separate narrative. Original bonus content / viewer instructions need inspection.",
      "sources": [
        "3d2"
      ]
    },
    {
      "title": "Sadako: Pendant of Mourning (2024); Hikiko-san vs. Sadako; unofficial Ring-like films",
      "type": "Independent lookalikes",
      "status": "License not proven; not added as official canon",
      "note": "2024 producer announcement found but no Suzuki / Kadokawa license. The name Sadako alone does not prove a Ring franchise work; avoid copying undifferentiated wiki film list.",
      "sources": [
        "pendant"
      ]
    }
  ],
  "audit": {
    "checked": "2026-10-27",
    "status": "Research edition — official media inventory / route contradictions reviewed; original-interior gaps disclosed",
    "checks": [
      "Suzuki six collected Ring books separated from Nakata films; Birthday split into three prose stories and manga-only SADAKO.",
      "Tide before S retained with qualified exact dates; Loop outer-world years not treated as ordinary film calendar.",
      "Published Ubiquitous serial recovered; 2025 rewritten novel represented as disputed connected variant, not silently omitted or called wholly unreleased.",
      "Ring shared in two incompatible Japanese film routes; shared prequel / manga copies identified so records are not mistaken for distinct works.",
      "Four-week Ring 2, five-year Sadako 3D2, six-month Ring Two and three-month TV Rasen intervals used instead of release years.",
      "Two television adaptations, Korean remake and 2005 short distinguished from similarly named features.",
      "Little Ring, three-story Sadako Kaidan plus frame, four-scenario 1998 anthology, three licensed comedy manga and mobile campaign inventoried.",
      "Adult Sadako VS Kayako is a verified original story; Shogakukan junior edition is the movie adaptation.",
      "No invented ASIN, no claims of full inaccessible interiors inspected; official editions / direct legitimate sources preferred.",
      "Final review preserved shared-work identifiers, same-source adaptation groups, original-crossover distinction, clock-domain caveat and explicit research-only access labels.",
      "Browser integration review: Loop, Rings (2017) and Sadako M retain a visible / counted main narrative while earlier scenes remain optional."
    ],
    "gaps": [
      "Full Japanese prose, manga panels, game routes and complete films not inspected. Legal BookWalker / Google previews attempted but inaccessible to web parser. Exact opening novel calendar and adaptation-only backstory remain qualified.",
      "Tide / S precise dates and nested ancient / childhood events, Loop outer-world age jumps, and Lemonheart later frame require original interiors; displayed relative positions are qualified.",
      "Ring: Death / Curse 2005 contents, original audio-drama / screenplay extras, Nagai original manga and Birthday original SADAKO dates need page-level comparison; collected editions not double-counted as new plots.",
      "2016–2017 Ubiquitous serial versus radically revised 2025 text needs direct comparison; author / publisher language conflicts are preserved.",
      "Sadako M full released updates / ending, Infinity WonderGate downloads, Dead by Daylight licensed Tome additions, pachinko and attraction original narratives remain incompletely inventoried; no exhaustive original-interior claim.",
      "Some entry buttons deliberately lead to clearly labeled corresponding bibliographic / developer evidence because current playable editions could not be verified. No unrelated purchase substituted."
    ],
    "publishReady": true,
    "suggestedSpan": "Sadako’s mid-twentieth-century past → contemporary / Reiwa cases, with Loop outer-world clock and Doomsday’s undated post-apocalypse separately qualified",
    "suggestedSeo": {
      "title": "Ring / Ringu / Sadako Chronological Watch & Reading Order",
      "description": "Compare Ring novels, Ringu film timelines, Spiral, Sadako, television, manga, games and The Ring remakes in story order, with continuity differences explained."
    }
  }
}