Universes/Ring / Ringu / Sadako/Research

PRE-BUILD INVENTORY · OCTOBER 27, 2026

The dates.
The evidence.

Ring / Ringu / Sadako: research table, product / access matches and inspection gaps.

VERIFICATION STATUS

Broad coverage.
Open questions.

76 catalogue records; 69 indexed works. Shared branch points, embedded scenes and anthology containers are distinguished.

A research edition, not a completed full-interior audit. A missing date remains an inspection gap until the actual work has been checked.

Inventory / contradiction 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.

Verification still required

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.

RESEARCH TABLE BEFORE PAGE BUILD

Every indexed record

Download source data

Compare story date, canon, continuity, actual inspection and edition / viewing match. Scroll horizontally for all columns.

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Entry	Media / release	Story date	Canon / continuity	Placement / inspection	Sources	Edition / viewing match
Birthday — LemonheartSadako’s stage career and doomed romance.	Prose shortReleased 1999	Sadako’s theater years; about 25–30 years before RingRelative / stated chronology	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Separate prequel story, not all of Birthday placed after Loop. Exact 1960s year not asserted without Japanese text.Source / inventory checked; full work not inspected	PRH / Vertical — Birthday Ring original — Japanese critical reading	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday — Lemonheart, older Toyama frameThe later reminiscence framing her story. · Embedded segment	Prose segmentReleased 1999	est. late 1980s–1990s; Decades after Sadako’s theater careerEvidence-based broad era	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	PRH / Vertical — Birthday	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring — Koji Suzuki novelKazuyuki Asakawa investigates a fatal videotape.	NovelReleased 1991	September–October; est. late 1980s–early 1990sEvidence-based estimate	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	Kadokawa — Ring novel Ring original — Japanese critical reading	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Spiral / Rasen — Koji Suzuki novelMitsuo Ando examines his dead friend.	NovelReleased 1995	est. late 1980s–early 1990s; Immediately after Ryuji’s death; months after Ring’s openingEvidence-based broad era	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	Kadokawa — Spiral novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday — Floating CoffinMai Takano’s missing period.	Prose shortReleased 1999	est. late 1980s–early 1990s; After Ryuji’s death; overlaps SpiralEvidence-based broad era	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	PRH / Vertical — Birthday	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Loop — Kaoru’s childhood / father’s research historyKaoru grows up around a simulation project. · Embedded segment	Novel segmentReleased 1998	Kaoru’s childhood; outer-world research eraRelative / stated chronology	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Outer-world calendar must not be equated to Ring’s simulated calendar. Sort anchor is only a reading / relative placement aid.Source / inventory checked; full work not inspected	PRH / Vertical — Loop and S	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Loop — adult Kaoru / cancer investigationKaoru investigates a spreading cancer.	NovelReleased 1998	Kaoru a medical student; years after his childhoodRelative / stated chronology	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Different clock domain from the simulated Ring / Spiral years. Numeric sort anchor preserves the revelation sequence without inventing a common calendar.Source / inventory checked; full work not inspected	PRH / Vertical — Loop and S	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday — Happy BirthdayReiko follows the Loop project.	Prose shortReleased 1999	After Kaoru’s disappearance in Loop; months laterRelative / stated chronology	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	The prose collection’s actual Loop epilogue. Not in MEIMU’s manga collection.Source / inventory checked; full work not inspected	PRH / Vertical — Birthday	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Tide — Kashiwada investigationKashiwada investigates his memories and Sadako’s family.	NovelReleased 2013	est. late twentieth–early twenty-first century; After Spiral / Loop revelations; before S main actionEvidence-based broad era	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	Kadokawa — Tide Kadokawa — 2013 Tide first edition	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
S / エスAn online suicide video threatens Takanori and Akane.	NovelReleased 2012	Takanori Ando’s adulthood; about a generation after SpiralRelative / stated chronology	Confirmed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Original prose, not Fuji Dario’s Sadako 3D novelization. Date measured by Ando’s son growing up; exact contemporary year unverified.Source / inventory checked; full work not inspected	PRH / Vertical — Loop and S	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ubiquitous — published 文芸カドカワ serialPublished continuation associated with Ryuji and the Loop.	Serial novelReleased 2016–2017	est. early twenty-first century; After Tide / S; renewed Loop-world crisisEvidence-based broad era	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	Suzuki interview — Ubiquitous Kadobun — Ubiquitous final serial installment Ubiquitous serial / collected-version comparison	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring — Kojiro Nagai mangaFirst manga adaptation of Suzuki’s novel.	MangaReleased 1996	Ring’s contemporary videotape case; est. late twentieth centuryEvidence-based estimate	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Same story position with adaptation changes qualified; not Inagaki’s subsequent screenplay manga.Source / inventory checked; full work not inspected	Kodansha — Ring by Kojiro Nagai	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Kadokawa Drama Renaissance — Ring radio drama / CDDramatized audio adaptation.	Audio dramaReleased 1996	Ring’s videotape case; est. late twentieth centuryEvidence-based estimate	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Three discs are one adaptation. Not score-only soundtrack; exact original broadcast / additional scenes need audio inspection.Source / inventory checked; full work not inspected	Oricon — Kadokawa Drama Renaissance Ring	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday manga — LemonheartThe prequel story retold by MEIMU.	Manga storyReleased 1999	Sadako’s theater years; decades before RingRelative / stated chronology	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	Same-story adaptation beside source. Its contents differ from prose collection, which also includes Happy Birthday.Source / inventory checked; full work not inspected	LINE Manga / Kadokawa — Birthday contents	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday manga — Floating CoffinMai’s missing period in manga.	Manga storyReleased 1999	est. late 1980s–early 1990s; After Ryuji’s death; overlaps SpiralEvidence-based broad era	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	LINE Manga / Kadokawa — Birthday contents	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Birthday manga — SADAKOAn original companion story in the manga collection.	Manga storyReleased 1999	est. mid-twentieth century; Sadako’s earlier life; before the videotape caseEvidence-based broad era	Assumed canonSuzuki prose — Ring / Spiral / Loop / Birthday / Tide / S	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.Source / inventory checked; full work not inspected	LINE Manga / Kadokawa — Birthday contents	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring 0: BirthdaySadako’s film-specific theater tragedy.	FilmReleased 2000	1968; decades before the videotape investigationRelative / stated chronology	Confirmed canonJapanese films — Ring → Ring 2 → Sadako	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.Source / inventory checked; full work not inspected	Ring 0: Birthday — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Ring / Ringu (1998)Reiko investigates the cursed tape.	FilmReleased 1998	Late summer / September; est. 1997Evidence-based estimate	Confirmed canonJapanese films — Ring → Ring 2 → Sadako	Common source film for two incompatible sequels. Film’s earlier Shizuko / Sadako recollections are not prose chronology; exact 1997 calendar remains qualified pending props.Source / inventory checked; full work not inspected	Ring (1998) — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Ring — Misao Inagaki upper / lower manga volumesScreenplay-derived manga reworking.	MangaReleased 1998–1999	The film’s videotape case; est. late 1990sEvidence-based estimate	Assumed canonJapanese films — Ring → Ring 2 → Sadako	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.Source / inventory checked; full work not inspected	Kadokawa — Ring: Curse combined manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring 0 — MEIMU mangaThe film prequel retold as manga.	MangaReleased 2000	1968; theater prequel periodRelative / stated chronology	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Distinct from Birthday manga’s Lemonheart. Same adaptation position, full panels not inspected.Source / inventory checked; full work not inspected	Kadokawa — Ring 0 manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring 0: BirthdaySadako’s film-specific theater tragedy.	FilmReleased 2000	1968; decades before the videotape investigationRelative / stated chronology	Confirmed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	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.Source / inventory checked; full work not inspected	Ring 0: Birthday — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Ring / Ringu (1998)Reiko investigates the cursed tape.	FilmReleased 1998	Late summer / September; est. 1997Evidence-based estimate	Confirmed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Common source film for two incompatible sequels. Film’s earlier Shizuko / Sadako recollections are not prose chronology; exact 1997 calendar remains qualified pending props.Source / inventory checked; full work not inspected	Ring (1998) — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Ring — Misao Inagaki upper / lower manga volumesScreenplay-derived manga reworking.	MangaReleased 1998–1999	The film’s videotape case; est. late 1990sEvidence-based estimate	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	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.Source / inventory checked; full work not inspected	Kadokawa — Ring: Curse combined manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring 0 — MEIMU mangaThe film prequel retold as manga.	MangaReleased 2000	1968; theater prequel periodRelative / stated chronology	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Distinct from Birthday manga’s Lemonheart. Same adaptation position, full panels not inspected.Source / inventory checked; full work not inspected	Kadokawa — Ring 0 manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring 2Mai and Yoichi face the curse’s aftermath.	FilmReleased 1999	Four weeks after Ring; est. late 1997Evidence-based estimate	Confirmed canonJapanese films — Ring → Ring 2 → Sadako	Alternative to Spiral. Four-week interval preferred to incorrectly using 1999 release as story date.Source / inventory checked; full work not inspected	Ring 2 — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Ring 2 — MEIMU mangaThe Nakata sequel adapted in manga.	MangaReleased 1999	Four-week sequel period; est. late 1997Evidence-based estimate	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Same central story position; adaptation-specific first-film recap does not require a new continuity.Source / inventory checked; full work not inspected	Kadokawa — Ring 2 manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Spiral / Rasen (1998)Ando’s autopsy opens a resurrection story.	FilmReleased 1998	Immediately after Ring’s Ryuji death; est. 1997Evidence-based estimate	Confirmed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Distinct from Fuji’s 1999 teacher-led TV sequel. Does not coexist with Ring 2’s fate for Yoichi.Source / inventory checked; full work not inspected	Spiral (1998) — narrative cross-check Arrow — Ringu Collection	View official four-film collectionRegion A edition includes Ring, Spiral, Ring 2 and Ring 0; does not include later Sadako films or television adaptations.
Spiral — Mizuki Sakura mangaAndo’s story in manga.	MangaReleased 1999	After the film’s Ryuji death; est. late 1990sEvidence-based estimate	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Creator calls this film adaptation. Do not assume prose continuity solely because credited to Suzuki. Differences / exact ending require panels.Source / inventory checked; full work not inspected	Kadokawa — Spiral manga Mizuki Sakura — creator interview	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3DA schoolteacher confronts a lethal streamed video.	FilmReleased 2012	Takanori’s adulthood; est. early 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Screen interpretation of S-related material. Takanori links to Ando route, but no merger with Suzuki’s full Loop mechanics inferred.Source / inventory checked; full work not inspected	Kadokawa Cinema — Sadako 3D PRH / Vertical — Loop and S	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3D2 — Nagi’s birth / early family historyAkane gives birth to Nagi. · Embedded segment	Film segmentReleased 2013	After Sadako 3D; before five-year-later main caseRelative / stated chronology	Confirmed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Separate birth frame; first film’s release year and sequel’s release year do not yield a one-year story interval.Source / inventory checked; full work not inspected	Kadokawa — Sadako 3D2	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3D2 — Fuko / Nagi presentNagi’s aunt investigates renewed deaths.	FilmReleased 2013	Five years after Sadako 3D’s video incidentRelative / stated chronology	Confirmed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Publisher-stated five-year interval. Numeric 2017 anchor extrapolates from estimated first-film era; it is not an independently verified calendar year.Source / inventory checked; full work not inspected	Kadokawa — Sadako 3D2	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3D: Resurrection — Fuji DarioOfficial film-story adaptation.	NovelReleased 2012	Earlier curse history → Takanori’s adulthood; est. early 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.Source / inventory checked; full work not inspected	Kadokawa — film-related book catalogue	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako — MEIMU (3D film manga)Official film-story adaptation.	MangaReleased 2012	Takanori’s adulthood; est. early 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.Source / inventory checked; full work not inspected	Kadokawa shareholder report — 3D adaptations	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3D2: Rebirth — Riu GotoOfficial film-story adaptation.	NovelReleased 2013	Nagi’s birth → five-year-later caseRelative / stated chronology	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.Source / inventory checked; full work not inspected	Kadokawa — Sadako 3D2: Rebirth novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako 3D2 — Usagi Yuki mangaOfficial film-story adaptation.	MangaReleased 2013	Five years after first online-video incidentRelative / stated chronology	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Source-story position retained; full text required for added earlier material and exact segmentation. Distinct from Suzuki’s original S novel.Source / inventory checked; full work not inspected	Kadokawa — Sadako 3D2 manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako (2019) — apartment fire / girl’s earlier lifeThe child survives an apartment fire. · Embedded segment	Film segmentReleased 2019	One week before Mayu’s hospital case; earlier childhood embeddedRelative / stated chronology	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Official synopsis’s one-week interval is a real clock; earlier upbringing not dated from 2019 release.Source / inventory checked; full work not inspected	Kadokawa Cinema — Sadako (2019)	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako (2019) — Mayu / Kazuma / MasamiA counselor and online filmmaker encounter Sadako.	FilmReleased 2019	Over twenty years after the earlier curse; est. late 2010sEvidence-based estimate	Confirmed canonJapanese films — Ring → Ring 2 → Sadako	Returning Masami supports Nakata route. Tide is a source credit, not proof identical people / chronology. Mayu is 24 in junior publisher synopsis.Source / inventory checked; full work not inspected	Kadokawa Cinema — Sadako (2019)Sadako — returning Masami link Kadokawa — Sadako adult novel Tsubasa — Sadako junior novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako — Osamu Makino novelOfficial adaptation of the 2019 film.	NovelReleased 2019	Over twenty years after earlier curse; est. late 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.Source / inventory checked; full work not inspected	Kadokawa — Sadako adult novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako — Yukiko Yamamuro junior novelOfficial adaptation of the 2019 film.	NovelReleased 2019	Over twenty years after earlier curse; est. late 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.Source / inventory checked; full work not inspected	Tsubasa — Sadako junior novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako — BLZ mangaOfficial adaptation of the 2019 film.	MangaReleased 2019	Over twenty years after earlier curse; est. late 2010sEvidence-based estimate	Assumed canonJapanese films — Ring → Ring 2 → Sadako	Same story position; publisher acknowledges differences / extra background in novels. Not a reprint of Tide or MEIMU’s 2012 Sadako manga.Source / inventory checked; full work not inspected	Kadokawa — Sadako manga	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako — unpublished Fantastic Kazuma videos (disc extras)Additional in-character video material.	Short video extrasReleased 2019	est. 2010s; During Kazuma’s online-video career; before disappearanceEvidence-based broad era	Assumed canonJapanese films — Ring → Ring 2 → Sadako	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.Source / inventory checked; full work not inspected	Kadokawa Cinema — Sadako (2019)	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako DXA rationalist investigates a 24-hour curse.	FilmReleased 2022	Reiwa era: 2019 onwardRelative / stated chronology	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Keep broad publisher-supported era. Reported Spiral-route connection / character identity still needs original verification; no new branch solely for this uncertainty.Source / inventory checked; full work not inspected	Kadokawa — Sadako DX novel Sadako DX — film route cross-check	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako DX — Osamu Makino novelExpanded prose version of the DX case.	NovelReleased 2022	Reiwa era: 2019 onwardRelative / stated chronology	Assumed canonJapanese films — Ring → Spiral → Sadako 3D / 3D2 / DX	Publisher explicitly promises film-omitted episodes. Full text required for earlier side stories; same present position as film.Source / inventory checked; full work not inspected	Kadokawa — Sadako DX novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring / Ring: KanzenbanKazuyuki’s television-film investigation.	TV filmReleased 1995	Contemporary videotape era; est. 1990sEvidence-based estimate	Confirmed canonRing (1995 television film)	Broadcast and uncensored / expanded home version grouped. Different adaptation from 1999 serial. Exact story year and cut additions uninspected.Source / inventory checked; full work not inspected	Ring 1995 — TV film inventory	View television-edition researchCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring: The Final Chapter — episodes 1–12Asakawa and Takayama investigate the tape.	TV serialReleased 1999	Contemporary 13-day curse case; est. late 1990sEvidence-based estimate	Confirmed canonRing: The Final Chapter → Rasen (TV)	Continuous main serial grouped, not twelve separate release-date entries. Earlier Sadako history remains embedded pending caption / episode inspection.Source / inventory checked; full work not inspected	Fuji TV — Rasen Fuji — Final Chapter final episodes	Read broadcaster episode archiveCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Rasen — episodes 1–13Teacher Ando confronts a new threat.	TV serialReleased 1999	Three months after The Final ChapterRelative / stated chronology	Confirmed canonRing: The Final Chapter → Rasen (TV)	Broadcaster’s thirteen-day rules and teacher protagonist distinguish this version from the autopsy film / novel.Source / inventory checked; full work not inspected	Fuji TV — Rasen Rasen TV — elapsed interval / episode count	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
The Ring Virus / 링Sun-ju investigates a fatal tape.	FilmReleased 1999	Contemporary pager / videotape era; est. 1990sEvidence-based estimate	Confirmed canonThe Ring Virus — Korean remake	Official remake; Eun-suh’s earlier history differs from Japanese film. Original Korean story clock not inferred from June 1999 release.Source / inventory checked; full work not inspected	The Ring Virus — Korean production record Darcy Paquet — The Ring Virus	View Korean edition / production researchCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
The Ring / The Ring Two / Rings — Samara’s earlier lifeSamara’s birth, adoption and well history. · Embedded segment	Film backstoryReleased 2002–2017	est. late twentieth century; Decades before Rachel’s videotape investigationEvidence-based broad era	Confirmed canonThe Ring — Samara Morgan	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.Source / inventory checked; full work not inspected	Paramount — The Ring The Ring Two — narrative cross-check Rings (2017) — narrative cross-check	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
The Ring (2002)Rachel tries to save Aidan and Noah.	FilmReleased 2002	Rachel’s videotape case; est. early 2000sEvidence-based estimate	Confirmed canonThe Ring — Samara Morgan	Main American remake. Seven-day interval is established; calendar year remains qualified pending props.Source / inventory checked; full work not inspected	Paramount — The Ring	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Rings (2005 short film)Jake records his encounter with the tape.	Short filmReleased 2005	After The Ring; final seven days before The Ring Two openingRelative / stated chronology	Confirmed canonThe Ring — Samara Morgan	Sixteen-minute narrative bridges the two films; not the 2017 feature. Exact DVD record supplied, not promise a current digital listing includes it.Source / inventory checked; full work not inspected	Rings (2005) — original DVD edition Rings (2005) — narrative cross-check	View exact short-film DVD researchCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
The Ring TwoRachel and Aidan face Samara again.	FilmReleased 2005	Six months after The RingRelative / stated chronology	Confirmed canonThe Ring — Samara Morgan	2005 release is not a three-year story jump. Birth / institutional history belongs in earlier backstory.Source / inventory checked; full work not inspected	The Ring Two — narrative cross-check	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Rings (2017) — airplane / recovered videotape prologueA later tape chain reaches an airplane. · Embedded segment	Film segmentReleased 2017	est. 2000s–2010s; Years after Rachel’s case; before Julia’s investigationEvidence-based broad era	Assumed canonThe Ring — Samara Morgan	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.Source / inventory checked; full work not inspected	Rings (2017) — narrative cross-check	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Rings (2017) — Gabriel / Julia / HoltStudents experiment with Samara’s tape.	FilmReleased 2017	Two years after airplane prologue; digital-video eraRelative / stated chronology	Assumed canonThe Ring — Samara Morgan	2017 is release date. No demonstrated contradiction requiring separate American continuity just because The Ring Two is not mentioned.Source / inventory checked; full work not inspected	Paramount — Rings (2017)Rings (2017) — narrative cross-check	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Little Ring I: Letter from the DeadYū receives an ominous chain letter.	NovelReleased 2010	Contemporary school era; chain-letter legend nearly fifty years oldRelative / stated chronology	Assumed canonOther official stories / reimaginings	Original licensed juvenile story. Included as assumed connected fiction; no verified exact bridge to Asakawa / Takanori and no invented second volume.Source / inventory checked; full work not inspected	Kadokawa — Little Ring I: Letter from the Dead	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako Kaidan — Prologue — Sho TomonoAn original Suzuki-supervised school horror story.	Prose shortReleased 2013	Contemporary school era; exact inter-story dates unverifiedRelative / stated chronology	Assumed canonOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	Group SNE — Sadako Kaidan creator interview / contents Kadokawa Yomeruba — Sadako Kaidan	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako Kaidan — But I Am the Real One / だけどわたしは本物だから — Sho TomonoAn original Suzuki-supervised school horror story.	Prose shortReleased 2013	Contemporary school era; exact inter-story dates unverifiedRelative / stated chronology	Assumed canonOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	Group SNE — Sadako Kaidan creator interview / contents Kadokawa Yomeruba — Sadako Kaidan	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako Kaidan — Shutter Chance / シャッターチャンス — Yuki OiAn original Suzuki-supervised school horror story.	Prose shortReleased 2013	Contemporary school era; exact inter-story dates unverifiedRelative / stated chronology	Assumed canonOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	Group SNE — Sadako Kaidan creator interview / contents Kadokawa Yomeruba — Sadako Kaidan	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako Kaidan — Cursed Melody / 呪われたメロディー — Tadaaki KawahitoAn original Suzuki-supervised school horror story.	Prose shortReleased 2013	Contemporary school era; exact inter-story dates unverifiedRelative / stated chronology	Assumed canonOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	Group SNE — Sadako Kaidan creator interview / contents Kadokawa Yomeruba — Sadako Kaidan	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
the Ring: Four More Frightening Stories — ON AIR — Yuji KobayashiAn original published Ring-premise scenario.	Scenario / prose storyReleased 1998	Videotape era; est. late twentieth centuryEvidence-based estimate	Assumed canonOther official stories / reimaginings	Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.Source / inventory checked; full work not inspected	CiNii — the Ring: Four More Frightening Stories	View corresponding anthology / library accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
the Ring: Four More Frightening Stories — Well / 井戸 — Yoshinobu FujiokaAn original published Ring-premise scenario.	Scenario / prose storyReleased 1998	Videotape era; est. late twentieth centuryEvidence-based estimate	Assumed canonOther official stories / reimaginings	Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.Source / inventory checked; full work not inspected	CiNii — the Ring: Four More Frightening Stories	View corresponding anthology / library accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
the Ring: Four More Frightening Stories — Someone Is Watching / 誰かが見ている — Yutaka OguraAn original published Ring-premise scenario.	Scenario / prose storyReleased 1998	Videotape era; est. late twentieth centuryEvidence-based estimate	Assumed canonOther official stories / reimaginings	Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.Source / inventory checked; full work not inspected	CiNii — the Ring: Four More Frightening Stories	View corresponding anthology / library accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
the Ring: Four More Frightening Stories — Loop of the Ring — Takaharu Okita / Manabu TeshigawaraAn original published Ring-premise scenario.	Scenario / prose storyReleased 1998	Videotape era; est. late twentieth centuryEvidence-based estimate	Assumed canonOther official stories / reimaginings	Kadokawa’s selected anthology of four new stories, not one of Suzuki’s six original books. Exact compatibility / dates need original interiors.Source / inventory checked; full work not inspected	CiNii — the Ring: Four More Frightening Stories	View corresponding anthology / library accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ubiquitous — 2025 collected rewriteMaezawa and Tsuyuki investigate unexplained deaths.	NovelReleased 2025	Contemporary era; includes a case fifteen years earlierRelative / stated chronology	Disputed canonOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	Kadokawa — Ubiquitous (2025)Suzuki interview — Ubiquitous Ubiquitous serial / collected-version comparison	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
My Neighbor Sadako-chan 2DLicensed comedy reimagining.	MangaReleased 2013	Modern apartment-life eraRelative / stated chronology	Non-canon connectedOther official stories / reimaginings	Official Sadako 3D gag spin-off; substantially different premise warrants a reimagining shelf. Continuous volume grouped; no chapter time jumps verified.Source / inventory checked; full work not inspected	Kadokawa — My Neighbor Sadako-chan 2D	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako-san and Sadako-chanLicensed comedy reimagining.	MangaReleased 2019 / English 2021	Modern online-video era; alongside 2019-film premiseRelative / stated chronology	Non-canon connectedOther official stories / reimaginings	Official 2019-film comedy; lighter tone alone does not prove it follows horror-film ending. Continuous volume grouped; no chapter time jumps verified.Source / inventory checked; full work not inspected	Seven Seas — Sadako-san and Sadako-chan	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Doomsday Sadako / 終末の貞子さんLicensed comedy reimagining.	MangaReleased 2019	Post-apocalyptic era; interval from core films unverifiedRelative / stated chronology	Non-canon connectedOther official stories / reimaginings	Official parody spin-off; no calendar 2100 asserted from numeric anchor. Continuous volume grouped; no chapter time jumps verified.Source / inventory checked; full work not inspected	Kadokawa — Doomsday Sadako announcement	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring / The Ring: Terror’s RealmMeg investigates deaths at the CDC.	GameReleased 2000	Contemporary CDC / computer-simulation era; exact year unverifiedRelative / stated chronology	Non-canon connectedOther official stories / reimaginings	Japanese and localized versions are the same released game. Borrowed Loop ideas do not prove prose-world sequel status; no release-year setting inferred.Source / inventory checked; full work not inspected	SEGA — Dreamcast licensed software list Dreamcast Ring — narrative / localization cross-check	View official licensed-game inventoryCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Ring ∞ / Ring Infinity — base scenarios / endingsOriginal portable text-adventure scenario.	GameReleased 2000	Contemporary videotape era; exact year unverifiedRelative / stated chronology	Assumed canonOther official stories / reimaginings	Original manual inventoried. Branching endings grouped; retired WonderGate downloads need separate publication / scenario inventory. Japanese chronology governs localization claims.Source / inventory checked; full work not inspected	Ring Infinity — original manual inventory	View original manual / edition researchCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako M — school deaths / Iwai investigationA school death case remains unresolved. · Embedded segment	Game segmentReleased 2021	Three years before detective-agency presentRelative / stated chronology	Assumed canonOther official stories / reimaginings	Developer explicitly states three-year interval; numeric 2018 is not verified fictional year.Source / inventory checked; full work not inspected	Now Production — Sadako M	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako M: Unsolved Case Detective Agency — published campaignAssistants pursue a missing investigator’s cases.	GameReleased 2021	Three years after school case; investigator disappearsRelative / stated chronology	Assumed canonOther official stories / reimaginings	Developer premise read. Complete chapter / update endings and retired-service access not recovered; no invented final resolution.Source / inventory checked; full work not inspected	Now Production — Sadako M	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Dead by Daylight: Sadako Rising — Sadako / adult Yoichi loreAdult Yoichi investigates disappearances.	Game storyReleased 2022	Yoichi’s adulthood; decades after Ring / Ring 2; Fog calendar unverifiedRelative / stated chronology	Non-canon connectedJapanese films — Ring → Ring 2 → Sadako	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.Source / inventory checked; full work not inspected	Behaviour — Sadako Rising design account Yoichi — published game lore transcription	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako vs. KayakoYūri and Suzuka face converging curses.	FilmReleased 2016	Modern digital-video era; est. 2010sEvidence-based estimate	Non-canon connectedSadako vs. Kayako	Two-day rule and altered curse-house circumstances distinguish crossover history from main films.Source / inventory checked; full work not inspected	Kadokawa Cinema — Sadako vs. Kayako	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako vs. Kayako — Kiyoshi Yamamoto junior novelJunior adaptation of the crossover film.	NovelReleased 2016	Modern era; same Yūri / Suzuka film caseRelative / stated chronology	Assumed canonSadako vs. Kayako	Shogakukan Junior Bunko, not Tsubasa. Same-story position; do not confuse with Kuro Shiro’s original adult novel.Source / inventory checked; full work not inspected	Sadako vs. Kayako junior edition Kadokawa Cinema — Sadako vs. Kayako	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako vs. Kayako — Kuro Shiro ORIGINAL novelKeiko and Kosakai film a confrontation of curses.	NovelReleased 2016	Modern documentary-video era; relation to film case unverifiedRelative / stated chronology	Assumed canonSadako vs. Kayako	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.Source / inventory checked; full work not inspected	Kadokawa — Kuro Shiro adult crossover novel	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
SADAKO and the Cursed Video — SCRAP / Gomi live storyParticipants seek an escape from the tape.	Live escape gameReleased 2023	Contemporary era; thirty minutes before curse activatesRelative / stated chronology	Non-canon connectedOther official stories / reimaginings	Original licensed interactive scenario; altered countdown / participatory variants qualified. Historical event page does not confirm current ticket availability.Source / inventory checked; full work not inspected	SCRAP — SADAKO and the Cursed Video	View corresponding edition / accessCorresponding publisher / distributor or exact edition research. Region / stock / subscription restrictions may apply; no unverified Amazon ASIN.
Sadako’s Well Life / 貞子の井戸暮らし — in-character web seriesSadako plays an actress living everyday life.	Web shortsReleased 2022–2023	Contemporary actress-Sadako persona; early 2020sRelative / stated chronology	Promotional onlyOther official stories / reimaginings	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.Source / inventory checked; full work not inspected	ASTRAY — official Sadako YouTube production Official Sadako channel — DX retrospective	Watch official web seriesExact channel linked by its production company; archive availability varies.

COVERAGE BOUNDARIES

Checked beyond the main stories

Manga collections

Ring: Curse / Ring: Death (2005 combined editions)

Collection / duplication review

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.

Kadokawa — Ring: Curse combined manga Kadokawa — Ring: Death combined manga

Audio drama

Birthday / Lemonheart radio-drama adaptation

Edition identification pending

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.

PRH / Vertical — Birthday Oricon — Kadokawa Drama Renaissance Ring

Script / audio adaptations

Published screenplay books; alternate film cuts; prose audiobooks

Same-story formats; exact edition inventory open

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.

Suzuki prose — scholarly publication inventory

Licensed interactive media

The Grudge / Ring crossover games, pachinko, mobile attractions, USJ Sadako narratives

Omission audit open

Licensed cosmetics and repeated footage are not automatically stories. Actual written campaigns / original attraction scripts need title-level check before exhaustive publication claim.

Behaviour — Sadako Rising design account SCRAP — SADAKO and the Cursed Video

Companion app

Sadako 3D2 Suma4D synchronized app

No separate story inferred

Synchronized screen effects alone do not establish a separate narrative. Original bonus content / viewer instructions need inspection.

Kadokawa — Sadako 3D2

Independent lookalikes

Sadako: Pendant of Mourning (2024); Hikiko-san vs. Sadako; unofficial Ring-like films

License not proven; not added as official canon

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.

Pendant of Mourning — producer announcement

SOURCE REGISTER

Primary sources first.

PrimaryKadokawa — Ring novel
Original Japanese prose edition and premise. Linked BookWalker legal sample attempted October 27; reader inaccessible to web parser. Not a full interior inspection.
PrimaryKadokawa — Spiral novel
Ando autopsy / Ring-virus premise; 1997 paperback is not the original 1995 publication or fictional date.
PrimaryPRH / Vertical — Loop and S
Official descriptions: Loop stands apart in the same story world; S follows adult Takanori, son of Spiral’s Mitsuo.
PrimaryPRH / Vertical — Birthday
Publisher describes Sadako’s theater past, Mai after Ryuji’s death and Reiko after Kaoru’s disappearance. Three stories, not one post-Loop episode.
PrimaryKadokawa — Tide
Kashiwada retains memories of Takayama and Futami. Same-series list verifies all six collected books.
PrimaryKadokawa — 2013 Tide first edition
Publisher text points to Shizuko’s history. User reviews are not publisher assertions of exact chronology.
Secondary / scholarly bibliographySuzuki prose — scholarly publication inventory
Academic paper read for first-edition and ancillary publication inventory, including 1998 scenario anthology.
Secondary / book criticismRing original — Japanese critical reading
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.
PrimarySuzuki interview — Ubiquitous
2024 author interview / editorial note calls work in progress a continuation from S / Tide.
PrimaryKadobun — Ubiquitous final serial installment
Publisher June 10 2017 announcement lists Ubiquitous as final installment in July issue. Actual serialized narrative was published; not an entirely unreleased project.
PrimaryKadokawa — Ubiquitous (2025)
New 440-page publication with Maezawa / Tsuyuki premise; promoted as complete new work. Relation to earlier serial requires original comparison.
Secondary / comparative reader accountUbiquitous serial / collected-version comparison
Reader reports earlier Ryuji / Loop serial differs from 2025 rewrite. Used only to flag comparison, not to certify precise canon.
PrimaryArrow — Ringu Collection
Official Region A set contains Ring, Spiral, Ring 2 and Ring 0. Distinguishes lost first sequel from Nakata’s sequel.
Secondary / film synopsisRing (1998) — narrative cross-check
Reiko / Ryuji / Yoichi route and decades-earlier psychic history. Exact story-year claims remain qualified.
Secondary / film synopsisSpiral (1998) — narrative cross-check
Alternative sequel’s resurrection / Ando plot cannot coexist with Ring 2’s surviving Yoichi route.
Secondary / film synopsisRing 2 — narrative cross-check
Four-week interval after original film; older body / well-survival reveal differs from prose.
Secondary / film synopsisRing 0: Birthday — narrative cross-check
Theater-era adaptation of Lemonheart, with film-specific split-Sadako story.
PrimaryKadokawa Cinema — Sadako 3D
Original 2012 release and Akane / Takanori / Kashiwada premise. 2019 reissue must not become original release or setting.
PrimaryKadokawa — Sadako 3D2
Official synopsis explicitly says five years after the cursed online-video incident. Catalogue’s 2019 reissue field does not override 2013 original release.
PrimaryKadokawa Cinema — Sadako (2019)
Official film premise, Tide source credit and physical / digital editions. Credits returning Hitomi Sato; film route not equated to the very different Tide plot.
Secondary / film narrative inventorySadako — returning Masami link
Returning Ring / Ring 2 character connects Nakata’s 2019 film; named source novel alone does not move it into prose world.
PrimaryKadokawa — Sadako DX novel
Publisher explicitly states Reiwa era, 24-hour curse and additional episodes absent from film.
Secondary / film inventorySadako DX — film route cross-check
Licensed new film; reported Spiral-route continuation remains qualified until original production testimony / complete film checked.
PrimaryKadokawa — Sadako DX official film site
Official corresponding 2022 film site, identified by credited cast / publisher promotion; distinct from Makino novel.
Secondary / television inventoryRing 1995 — TV film inventory
Broadcast adaptation and Kanzenban home cut are the same core story.
PrimaryFuji TV — Rasen
Broadcaster explicitly follows Final Chapter, uses thirteen-day curse and a 34-year-old teacher Ando.
PrimaryFuji — Final Chapter final episodes
Official episode-synopsis archive found; legacy Shift-JIS text misdecoded in web parser. Not claimed fully read.
Secondary / television referenceRasen TV — elapsed interval / episode count
13 episodes; main story three months after previous serial.
Industry / film catalogueThe Ring Virus — Korean production record
Production / cast / original Korean narrative synopsis read.
Secondary / specialist film criticismDarcy Paquet — The Ring Virus
Confirms official Japanese–Korean remake; Sun-ju / Eun-suh characters.
PrimaryParamount — The Ring
Official remake edition / access and Rachel / Aidan premise.
Secondary / film synopsisThe Ring Two — narrative cross-check
Six months after original; Samara’s mother history and present possession story.
PrimaryZee5 — The Ring Two licensed access
Corresponding licensed film destination; region / rental restrictions vary.
Secondary / physical-edition recordRings (2005) — original DVD edition
DreamWorks 16-minute short, not the 2017 feature.
Secondary / short-film synopsisRings (2005) — narrative cross-check
Jake’s seven-day diary runs directly into The Ring Two opening.
PrimaryParamount — Rings (2017)
Professor / students experiment narrative, digital access verified.
Secondary / film synopsisRings (2017) — narrative cross-check
Earlier airplane / videotape discovery and later Julia inquiry separated. Does not establish incompatible alternate world solely by omitting Rachel.
PrimaryKodansha — Ring by Kojiro Nagai
1996 original manga adaptation, distinct from Inagaki’s film-script version.
PrimaryKadokawa — Ring: Curse combined manga
Inagaki / Takahashi / Suzuki source credits; 2005 collection not assumed a new story beyond original upper / lower volumes.
PrimaryKadokawa — Spiral manga
Mizuki Sakura; 1999 paper / 2013 ebook. Author calls it film comic adaptation in Wacom interview; original interior needed for precise divergence.
PrimaryMizuki Sakura — creator interview
Creator identifies Spiral and Kuroyuri Danchi as film comic adaptations.
PrimaryKadokawa — Ring 2 manga
MEIMU; February 3 1999 original edition.
PrimaryKadokawa — Ring 0 manga
MEIMU; January 28 2000, film-derived prequel adaptation.
PrimaryLINE Manga / Kadokawa — Birthday contents
Legal serialized edition explicitly lists Floating Coffin, Lemonheart and original SADAKO. Happy Birthday is not among manga contents.
PrimaryKadokawa — Ring: Death combined manga
512 pages / MEIMU; Mai investigates Ryuji. Contents need inspection before treating collection title as a wholly new sequel.
PrimaryKadokawa shareholder report — 3D adaptations
Publisher lists S, Fuji Dario’s Resurrection novel and MEIMU’s Sadako comic as distinct related products.
PrimaryKadokawa — film-related book catalogue
Official corresponding series catalogue includes Sadako 3D: Resurrection, July 2013 sequel novel, adult crossover and comedy.
PrimaryKadokawa — Sadako 3D2: Rebirth novel
Riu Goto, not Suzuki’s next original novel; film adaptation and birth frame.
PrimaryKadokawa — Sadako 3D2 manga
Usagi Yuki; 2013 film adaptation, not novel by Goto.
PrimaryKadokawa — Sadako adult novel
Osamu Makino; publisher explicitly says movie novelization with additional background and some differences.
PrimaryTsubasa — Sadako junior novel
Yukiko Yamamuro / Ryo Akizuki, not Makino edition; Mayu age 24; adaptation variants acknowledged.
PrimaryKadokawa — Sadako manga
BLZ / Suzuki / Sugihara; November 2019 movie adaptation.
PrimaryKadokawa — Little Ring I: Letter from the Dead
Aki Mizuno original junior story with Suzuki credited for premise; title’s I does not prove additional volumes exist.
PrimaryGroup SNE — Sadako Kaidan creator interview / contents
Creator page explicitly lists prologue and three stories by Tomono, Oi and Kawahito, and discusses original premises.
PrimaryKadokawa Yomeruba — Sadako Kaidan
Suzuki-supervised original school-story anthology; legal sample linked.
Institutional bibliographyCiNii — the Ring: Four More Frightening Stories
Institutional contents: ON AIR, Well, Someone Is Watching, Loop of the Ring. Kadokawa 1998 original scenario anthology.
Industry / edition recordOricon — Kadokawa Drama Renaissance Ring
1996 three-CD drama, PSCR-5497/9, not merely score music.
PrimaryKadokawa — My Neighbor Sadako-chan 2D
Yuji Ihara / Suzuki-supervised official 3D gag spin-off.
PrimarySeven Seas — Sadako-san and Sadako-chan
Official English edition; 2019 movie copyright and modern-video premise.
PrimaryKadokawa — Doomsday Sadako announcement
Koma Natsumi’s official 2019 film parody spin-off; not ordinary film-future canon.
PrimarySEGA — Dreamcast licensed software list
Ring, Kadokawa / Asmik, February 24 2000, T-27902M.
Secondary / game catalogueDreamcast Ring — narrative / localization cross-check
Meg / CDC scenario; Japanese Ring and Terror’s Realm same game rather than two sequels.
Original manual / third-party archiveRing Infinity — original manual inventory
Original game manual images hosted in preservation collection; original scenario and retired WonderGate service. Full images / game routes not inspected.
PrimaryNow Production — Sadako M
Developer story: school deaths, three years later detective disappears. Licensed mobile original; October 26 2021 release.
PrimaryBehaviour — Sadako Rising design account
Developer-authored account of licensed Sadako / adult Yoichi continuation.
Secondary / game-lore transcriptionYoichi — published game lore transcription
Adult university professor’s new case; official license holder allowed new lore. In-game text not directly loaded.
PrimaryKadokawa Cinema — Sadako vs. Kayako
Official two-day curse and Yūri / Suzuka / Keizo film story.
PrimaryKadokawa — Kuro Shiro adult crossover novel
Explicit ORIGINAL STORY: Keiko / Kosakai documentary crew. This is not the Yūri / Suzuka screenplay retold.
Retail / publisher-description reproductionSadako vs. Kayako junior edition
Kiyoshi Yamamoto / Shogakukan, ISBN 9784092308695. Film protagonists, distinct from adult original.
PrimarySCRAP — SADAKO and the Cursed Video
Official licensed live escape narrative, thirty-minute deadline. Historical event page, not promise tickets still available.
PrimaryASTRAY — official Sadako YouTube production
Production company identifies official actress-Sadako slice-of-life channel and links actual channel.
PrimaryOfficial Sadako channel — DX retrospective
October 2022 official in-character video; recap is not another main-film sequel.
PrimaryPendant of Mourning — producer announcement
2024 independent production announcement. No Kadokawa / Suzuki license proven; title similarity alone insufficient.

The dates.The evidence.

Broad coverage.Open questions.