is a japanese manga series. it was written by jinsei kataoka and illustrated by kazuma kondouit. it was published in "shōnen ace" since 2008. tokyopop got the licensing rights to distribute the manga in english. it released the first 5 volumes of the manga before the company shut down its north american publishing division in 2011. viz media announced that it had licensed the series for english language release in north america on july 7, 2013. it released the first volume on february 11, 2014; new volumes were released every two months after that.