It began serialization in the January 2005 issue of Square Enix's Young Gangan seinen manga magazine. The first bound volume was released in November 2005 in Japan; as of March 2009, six volumes have been released. Square Enix released three drama CDs between 2007 and 2009 with scripts written by Shogo Mukai. An anime series produced by A-1 Pictures and directed by Yoshimasa Hiraike will begin airing in Japan on April 4, 2010.