Story Arcs

Index Arc

 * Light Novels: Toaru Majutsu no Index Vol. 01
 * Manga Chapters: 001, 002 , 003 , 004 , 005 , 006 , 007 , 008 , 009 , 010
 * Anime Episodes: 01, 02 , 03 , 04 , 05 , 06

Deep Blood Arc

 * Light Novels: Toaru Majutsu no Index Vol. 02
 * Manga Chapters: NOT included in the Manga
 * Anime Episodes: 07, 08 , 09

Sisters Arc

 * Light Novels: Toaru Majutsu no Index Vol. 03
 * Manga Chapters: 011, 012 , 013 , 014 , 015 , 016 , 017 , 018 , 019 , 020 , 021
 * Anime Episodes: 10, 11 , 12 , 13 , 14

Angel Fall Arc

 * Light Novels: Toaru Majutsu no Index Vol. 04
 * Manga Chapters: NOT included in the Manga
 * Anime Episodes: 15, 16 , 17

Three Stories Arc

 * Light Novels: Toaru Majutsu no Index Vol. 05
 * Manga Chapters: 022, 023 , 024 , 025 , 026 , 027 , 028 , 029 , 030 , 031 , 032 , 033
 * Anime Episodes: 18, 19 , 20 , II 01

Kazakiri Hyouka Arc

 * Light Novels: Toaru Majutsu no Index Vol. 06
 * Manga Chapters: 034, 035 , 036 , 037 , 038 , 039
 * Anime Episodes: 21, 22 , 23 , 24

Orsola Aquinas and the Book of Law Arc

 * Light Novels: Toaru Majutsu no Index Vol. 07
 * Manga Chapters: NOT yet released
 * Anime Episodes: II 02, II 03 , II 04

Musujime Awaki and the Remnants of Tree Diagram Arc

 * Light Novels: Toaru Majutsu no Index Vol. 08
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Oriana Thompson and the Daihasei Sports Festival Arc

 * Light Novels: Toaru Majutsu no Index Vol. 09 and Vol. 10
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Anieze Sanctis and La Regina del Mare Adriatico Arc

 * Light Novels: Toaru Majutsu no Index Vol. 11
 * Manga Chapters: n/a
 * Anime Episodes: n/a

They Way of Light and Darkness Arc

 * Light Novels: Toaru Majutsu no Index Vol. 12 and Vol. 13
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Terra of the Left and the Document of Constantine Arc

 * Light Novels: Toaru Majutsu no Index Vol. 14
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Battle Royale Arc

 * Light Novels: Toaru Majutsu no Index Vol. 15
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Itsuwa and Aqua of the Back's Attack Arc

 * Light Novles: Toaru Majutsu no Index Vol. 16
 * Manga Chapters: n/a
 * Anime Episodes: n/a

War in Britain Arc

 * Light Novels: Toaru Majutsu no Index Vol. 17 and Vol. 18
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Dragon(≠Angel) Arc

 * Light Novels: Toaru Majutsu no Index Vol. 19
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Fiamma of the Right and the World War III Arc

 * Light Novels: Toaru Majutsu no Index Vol. 20, Vol. 21 and Vol. 22
 * Manga Chapters: n/a
 * Anime Episodes: n/a

Introduction Arc

 * Manga Chapters:
 * Anime Episodes: 01, 02 , 05

Level Upper Arc

 * Manga Chapters:
 * Anime Episodes: 03, 04 , 06 , 07 , 08 , 09 , 10 , 11 , 12 , 13 , 14

Big Spider Arc (Anime Only Arc)

 * Manga Chapters: NOT included in the Manga
 * Anime Episodes: 15, 16

Poltergeist Arc (Anime Only Arc)

 * Manga Chapters: NOT included in the Manga
 * Anime Episodes: 17, 18 , 19 , 20 , 21 , 22 , 23 , 24

Sisters Arc

 * Manga Chapters:
 * Anime Episodes: Not included in Toaru Kagaku no Railgun and Toaru Kagaku no Railgun OVA