The first chapter was released in 2001 in the Monthly Shōnen Jump, but afterwards the chapters were released in the Weekly Shōnen Jump on a monthly basis due to the discontinuation of the prior magazine. The manga is currently serialized in the Jump Square magazine, Shueisha's replacement for the Monthly Shōnen Jump. As of July 2010 105 chapters have been released in Japan. An anime adaptation of the manga was announced in the October 2006 edition of the Monthly Shōnen Jump. The first episode of the anime aired on April 3, 2007 on Nippon Television, with the last one shown on September 25, 2007.