An audio drama CD was included with the limited edition of the sixth volume in April 2013 .
Ototachibana launched the series in Enterbrain 's B 's - Log Comic magazine on 12 March 2008 .
An audio drama CD was included with the limited edition of the sixth volume in April 2013 .
Ototachibana launched the series in Enterbrain 's B 's - Log Comic magazine on 12 March 2008 .