7th light novel cover

Written by Mikage Kasuga and illustrated by Miyama-Zero, the light novels of the series were first introduced to the public in August 2009. As of 2017, there are currently 19 volumes.

A Manga adaption and spin-off to the Manga have also been released.

A 12-episode anime aired in July 2012 based off of Mikage's work, loosely covering the story of the first four volumes of the Light Novels. there is currently no indication of a continuation of the anime.

After a year long hiatus, the series continued from volume 10.