The manga was adapted into an anime series directed by Takayuki Hamana, animated by Trans Arts and co-produced by Nihon Ad Systems & TV Tokyo. The anime aired across Japan on the anime satellite television network Animax and the terrestrial TV Tokyo network from October 10, 2001 to March 30, 2005, spanning a total of 178 episodes, as well as a theatrical movie. In April 2006, an original video animation (OVA) continuation of the anime began to be released on DVD. The beginning of the second OVA series was released on June 22, 2007, roughly 3 months after the end of the first. The second OVA ended on January 25, 2008, and the third and final OVA started on April 25, 2008.
The series developed into a media franchise and has had numerous other adaptations outside of the animated incarnation. Since April 2003, more than fifteen stage musicals have been produced for the series. An animated movie was released in 2005, as well as a live action movie in 2006. The franchise has also had a long-running radio show, numerous video games, soundtracks, and other merchandise or collectibles.