A Certain Magical Index: The Movie – The Miracle of Endymion is a 2013 Japanese animated film based on an original story written by Kazuma Kamachi featuring the characters of his light novel series A Certain Magical Index. Produced by J.C.Staff and distributed by Warner Bros. Pictures Japan, the film is directed by Hiroshi Nishikiori from a script written by Hiroyuki Yoshino and stars Atsushi Abe, Yuka Iguchi, Rina Satō, and Sachika Misawa. In the film, Toma Kamijo and Index meet Arisa Meigo, who has a mysterious past, as magicians target her for being a threat to the balance between the world of magic and science.

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 in a total of three separate series. The first ran from April 2004 to October 2010, the second from March 2011 to July 2019, and the third from February 2020 to present.