Where the anime ends, and where the books carry onAnime, manga, light novels and web novels, lined up by story arc

Arc Almanac

21 Oct 2026Draft. Not yet checked against the books.

All series / A Certain Magical Index / Arc 20

Arc 20 of 66 in A Certain Magical Index

Arc 20: Yuzuriha Ringo

In the story: Sep

Arc name chosen by Arc Almanac, because the books don’t name it.

I’ve watched through

Index I stops before this arc.

Railgun stops before this arc.

Earlier in story order than the end of Index II.

Earlier in story order than the end of The Miracle of Endymion.

Railgun S stops before this arc.

Earlier in story order than the end of Index III.

Earlier in story order than the end of Accelerator.

Earlier in story order than the end of Railgun T.

Item (episodes 1–2; airing) stops before this arc.

What happens

Kakine meets Ringo, a young subject of the Dark May Project. The competing interests pursuing her draw him into a struggle that explores another corner of Academy City's experiments and the people they leave behind.

Where it sits

Yuzuriha Ringo in A Certain Magical Index
FormatVolumesUnitsLanguage
Manga — A Certain Scientific Dark MatterVol 1Chapters 1–4Japanese

Draft. Not yet checked against the books. Report a wrong mapping.