A Certain Magical Index

is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura, which has been published by ASCII Media Works under their Dengeki Bunko imprint since April 2004.

A Certain Magical Index and A Certain Magical Index SS have been licensed for an English release by Yen Press under their Yen On imprint.

Synopsis
Academy City, a technologically advanced independent city-state located in the west of Tokyo known for its educational and research institutions, and populated with those of supernatural abilities. A young high school student named Tōma Kamijō has an unusual ability until he encounters an English nun named Index. His ability and relationship with Index prove dangerous to other sorcerers and Espers who want to discover the secrets behind him and Index, as well as the city.

A Certain Magical Index
Adaptation of the first 6 volumes of the light novel, produced by J.C.STAFF. Aried for 24 episodes between October 5, 2008 and March 19, 2009

A Certain Magical Index II
Adaptation of Volume 7 - 13 and SS of the light novel. Aired for 24 episodes between October 8, 2010 and April 1, 2011

A Certain Magical Index III
Adaptation of Volume 14 - 22 of the light novel. Aired for 26 episodes between October 5, 2018 and April 5, 2019

Volume 1
List of Episodes that adapted the first volume of the light novel.

Volume 2
List of Episodes that adapted the second volume of the light novel.

Volume 3
List of Episodes that adapted the third volume of the light novel.

Volume 4
List of Episodes that adapted the fourth volume of the light novel.

Volume 5
List of Episodes that adapted the fifth volume of the light novel.

Volume 6
List of Episodes that adapted the sixth volume of the light novel.

Volume 7
List of Episodes that adapted the seventh volume of the light novel.

Volume 8
List of Episodes that adapted the eighth volume of the light novel.

Volume 9 - 10
List of Episodes that adapted the ninth and tenth volume of the light novel.

Volume 11
List of Episodes that adapted the eleventh volume of the light novel.

Volume 12 - 13
List of Episodes that adapted the twelfth and thirteenth volume of the light novel.

Volume SS
List of Episodes that adapted the A Certain Magical Index SS light novel.

Volume 14
List of Episodes that adapted the fourteenth volume of the light novel.

Volume 15
List of Episodes that adapted the fifteenth volume of the light novel.

Volume 16
List of Episodes that adapted the sixteenth volume of the light novel.

Volume 17 - 18
List of Episodes that adapted the seventeenth and eighteenth volume of the light novel.

Volume 19
List of Episodes that adapted the nineteenth volume of the light novel.

Volume 20 - 22
List of Episodes that adapted the twentieth, twenty-first and twenty-second volumes of the light novel.