 The first "tankōbon" (collected volume) was released by Shogakukan on October 25, 1997, and the latest volumethe 43rdwas released on June 26, 2019.In North America, Viz Media acquired the series rights and published the manga in its female-targeted magazine "Shojo Beat", from the first issue in July 2005 until September 2006.Later, it was published in the "tankōbon" format; the first volume was released on January 3, 2006, and the latestthe 27thwas released on October 1, 2019.