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Arc Almanac

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

All series / A Certain Magical Index / Arc 15

Arc 15 of 66 in A Certain Magical Index

Arc 15: Railgun intermission

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.

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.

Partly seen by the end of Railgun S.

Earlier in story order than the end of Index III.

Earlier in story order than the end of Accelerator.

Partly seen by the end of Railgun T.

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

What happens

Between the major Railgun conflicts, Tokiwadai's cliques and Mikoto's circle continue their everyday lives. These shorter episodes connect the aftermath of Sisters to the school relationships and events that matter during the approaching festival.

Parts of this arc

  1. The Iron Bridge Is a Sign of Love
  2. Clique
  3. Rainbow’s End

Where it sits

Railgun intermission in A Certain Magical Index
FormatVolumesUnitsLanguage
Manga — A Certain Scientific RailgunVol 7Extra 39 special–chapter 42Japanese
Manga — A Certain Scientific RailgunVol 7Extra 39 special–chapter 42English
Anime — A Certain Scientific RailgunRailgun SSeason 2, episodes 16–17—

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