Toaru Majutsu no Index
(とある魔術の禁書目録（インデックス）, lit. Toaru Majutsu no Kinshomokuroku (Indekkusu)
?, translated as A Certain Magical Index of Prohibited Books (shortened to A Certain Magical Index
) is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura; the series is published by ASCII Media Works under their Dengeki Bunko
imprint. The series was made into a manga, beginning serialization in May 2007, and an anime which aired between October 2008 and March 2009, containing twenty-four episodes. A side story manga series, Toaru Kagaku no Railgun
(とある科学の超電磁砲（レールガン）, Toaru Kagaku no Rērugan
?, lit. A Certain Scientific Railgun
), began serialisation in March 2007 and was later adapted into an anime, which began airing in October 2009.
Toaru Majutsu no Index
is set in a city of scientifically advanced superhuman students, but in a world where magic is also real. Tōma Kamijō's right hand, the Imagine Breaker, will negate all magic, psychic, or divine powers, as well as his own luck. One day he finds a young girl hanging on his balcony railing named Index. She turns out to be a nun from the Church of England, and her mind has been implanted with the Index Librorum Prohibitorum
—all the magical texts the Church has removed from circulation. His encounter with her leads him to meet others from the secret world of science and magic and an adventure with his friends where science and magic collide. Tōma's unusual power places him at the center of conflicts relating magicians and science-based espers in Academy City. As Tōma tries to help and protect his friends, he learns the people he knows are not as they appear and begins to attract the attention of magicians and espers alike as they try to unravel the secrets of Academy City and Index.
The side-story, Toaru Kagaku no Railgun
, focuses on Mikoto Misaka, an electromaster who is the third most powerful of the seven Level 5 espers in Academy City. Set before and during the events of the novels, the manga tell the adventures of Mikoto and her friends during that time period from their point of view.
The light novels have been published by ASCII Media Works under their Dengeki Bunko
label since April 10, 2004. As of November 2009, there are nineteen novels and two short story collections.
A drama CD was released as a mail-in order of Dengeki hp
volume 48 and was released later in November 2007. There are two parts of story, the first part originally aired as a radio drama in Dengeki Taishō
starts with an encounter with mysterious self-proclaimed "former" magician by Tōma Kamijō and Index in the family restaurant after Misaka decide to go back due to urgent business. The second part involves around Mikoto Misaka and Kuroko Shirai with their "urgent business", and a duel request by a Level 3 Psychic girl from Tokiwadai.