Since the series' premiere, over sixty chapters have been released in Japan. The individual chapters are published in tankōbon by Square Enix under their Gangan Comics imprint. The first volume was released on November 27, 2004 and as of December 9, 2009, twelve volumes have been released. The chapters were adapted into an anime series directed by Kunihisa Sugishima, and animated by J.C.Staff. It began airing in April 2008 and ended its run in September 2008.