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Arc Almanac

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

All series / A Certain Magical Index / Arc 2

Arc 2 of 66 in A Certain Magical Index

Arc 2: Enemy Item

In the story: 30 Jun – 31 Jul, 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.

Partly seen by the end of Item (episodes 1–2; airing).

What happens

Mugino's team takes shape in Academy City's underground, with Kinuhata joining its ranks. A second group using the Item name draws the four girls into a struggle around an illegal fighting venue.

Parts of this arc

  1. Formation of Item
  2. Between the Lines 1
  3. The Fifth Girl
  4. Between the Lines 2
  5. Colosseum
  6. Rescue
  7. Level 5
  8. Aftermath

Where it sits

Enemy Item in A Certain Magical Index
FormatVolumesUnitsLanguage
Light novel — A Certain Dark ItemVol 1Prologue–epilogueJapanese
Manga — A Certain Dark ItemVol 1, 2Chapters 1–18Japanese
Anime — A Certain Dark ItemItem (episodes 1–2; airing)Season 1, episode 2—

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