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 37

Arc 37 of 66 in A Certain Magical Index

Arc 37: DRAGON

In the story: 17 Oct

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.

Index II stops before this arc.

The Miracle of Endymion stops before this arc.

Railgun S stops before this arc.

Seen by the end of Index III.

Accelerator stops before this arc.

Railgun T stops before this arc.

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

What happens

Accelerator investigates the name DRAGON while Academy City's underground puts renewed pressure on Hamazura. Their separate searches for a way to protect Last Order and Takitsubo lead toward the larger conflict gathering outside the city.

Where it sits

Arc 37 in A Certain Magical Index
FormatVolumesUnitsLanguage
Light novel — A Certain Magical IndexVol 19Prologue–epilogueJapanese
Light novel — A Certain Magical IndexVol 19Prologue–epilogueEnglish
Manga — A Certain Magical IndexVol 32, 33, 34Chapters 197–211Japanese
Manga — A Certain Magical IndexVol 32Chapters 197–211English
Anime — A Certain Magical IndexIndex IIISeason 3, episodes 15–17—

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