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 66

Arc 66 of 66 in A Certain Magical Index

Arc 66: Narthex

In the story: 9 Jan, the year after

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.

Index III stops before this arc.

Accelerator stops before this arc.

Railgun T stops before this arc.

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

What happens

Hamazura flees through Academy City with Aneri while Necessarius pursues him. Touma works with Birdway and Lessar on a separate search for an enemy, as questions of loyalty connect their investigations.

Where it sits

Narthex in A Certain Magical Index
FormatVolumesUnitsLanguage
Light novel — A Certain Magical Index: Genesis TestamentVol 15Prologue–epilogueJapanese

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