The manga initially began as three separate one-shots serialized between June 24, 2003 and November 26, 2003 in two manga magazines published by Square Enix. The first one-shot was published in the summer 2003 special edition of Gangan Powered, the second following in the autumn 2003 special edition of the same magazine, and the third serialized in Gangan Wing. The manga started regular serialization in Square Enix's Monthly Shōnen Gangan magazine on May 12, 2004. The first tankōbon was released by Square Enix under their Gangan Comics imprint on June 22, 2004 in Japan; as of July 22, 2010, 17 volumes have been released.