There was a confusion raised due to the English naming of the series.

A reprint of novels was announced at the same time as the anime and the live-action films, the first reprinted volume was released on Septemand further volumes were reprinted on monthly schedule. The series was published by Kadokawa Shoten under the imprint Sneaker Bunko, started on May 30, 2009, the seventh and final volume was released on March 31, 2012. The light novel series is written by Yutaka Kono and illustrated by You Shiina. A second manga is scheduled to accompany the anime and live-action films, Tatsu Nohana is drawing the manga, while Yutaka Kōno himself is supervising the manga and writing the script. The series was compiled into two volumes, both published on November 22, 2011. It premiered on April 5, 2017.Ī manga adaptation by Masahiko Yoshihara began serializing in the February 2011 issue of Kadokawa's shōnen manga magazine Monthly Shōnen Ace in December 2010. The anime adaptation of the light novel series is directed by Shin'ya Kawatsura, with series compostion and script by Katsuhiko Takayama, character designs by Tomoyuki Shitaya and David Production is the charge of the animation.

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