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 26

Arc 26 of 66 in A Certain Magical Index

Arc 26: La Regina del Mare Adriatico

In the story: 25–26 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.

Seen by the end of Index II.

Seen by the end of The Miracle of Endymion.

Railgun S stops before this arc.

Seen by the end of Index III.

Accelerator stops before this arc.

Earlier in story order than the end of Railgun T.

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

What happens

A prize trip takes Touma and Index to northern Italy. Their holiday becomes a struggle over an old magical weapon and the people being forced to operate it, with Venice caught in the danger.

Where it sits

La Regina del Mare Adriatico in A Certain Magical Index
FormatVolumesUnitsLanguage
Light novel — A Certain Magical IndexVol 11Prologue–epilogueJapanese
Light novel — A Certain Magical IndexVol 11Prologue–epilogueEnglish
Manga — A Certain Magical IndexVol 15, 16Chapters 86–96Japanese
Manga — A Certain Magical IndexVol 15, 16Chapters 86–96English
Anime — A Certain Magical IndexIndex IISeason 2, episodes 14–16—

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