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 4

Arc 4 of 66 in A Certain Magical Index

Arc 4: Dark Justice

In the story: 29–31 Aug, the year before

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

I’ve watched through

Earlier in story order than the end of Index I.

Earlier in story order than the end of Railgun.

Earlier in story order than the end of Index II.

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

Earlier in story order than the end of Railgun S.

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

People claiming to act for justice begin confronting Item. The team has to navigate attacks from several directions while testing what those declarations mean in a city whose official and underground institutions overlap.

Where it sits

Arc 4 in A Certain Magical Index
FormatVolumesUnitsLanguage
Light novel — A Certain Dark ItemVol 3Prologue–epilogueJapanese

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