A manga adaptation by 888 started serialization in the seinen manga magazine " Monthly Comic Alive " on August 26, 2006.
Another manga adaptation by Hitomi Nakao started serialization in the seinen manga magazine " Monthly Comic Alive " on February 27, 2008.
A manga adaptation illustrated by Junichi Iwasaki began serialization in the November 2010 issue of Media Factory's manga magazine " Monthly Comic Alive ".
A manga adaptation illustrated by Issei Hyoju was serialized between the September 2008 and February 2012 issues of Media Factory's " Monthly Comic Alive ".
It has been published by Media Factory in its " Monthly Comic Alive " magazine since November 2009 . Eleven compiled volumes have been released so far.
A spinoff comedy manga, titled, was illustrated by Nini and serialized in Media Factory's " Monthly Comic Alive "'s March 2011 issue.
A side series, titled, by Yuizaki Kazuya, began serialization in the July 2015 issue of " Monthly Comic Alive " on May 27, 2015.
A manga adaptation with art by Ningen began serialization in Media Factory's " seinen " manga magazine " Monthly Comic Alive " from January 2013.
A fifth manga, titled and illustrated by Norio Tsukudani, was serialized between the November 2012 and October 2013 issues of Media Factory's " Monthly Comic Alive ".
There has been two manga adaptations : the first is serialized in the comic magazine " Comptiq ", and the second is serialized in " Monthly Comic Alive ".