The first Toaru Majutsu no Index light novel volume was first published on April 10, 2004. It is the first novel in the Toaru Majutsu no Index series and the debut novel of Kamachi Kazuma for Dengeki Bunko. The volume was later localized in Chinese for release in Taiwan and Hong Kong on August 29, 2007 and Mainland China on February 2, 2012. An English version of the volume was released on November 18, 2014.