A 2009-current light novel series by Kamachi Kazuma, with illustrations by Nagi Ryou, serialized in ASCII Media Works' Dengeki Bunko Magazine and published under the Dengeki Bunko imprint. Also adapted into a 2010 manga by Inue Shinsuke, which was serialized in Dengeki Maou. An anime adaptation began airing Fall season 2015 in Japan.
