there is an anime series based on this manga. it was directed by takayuki hamana and animated by trans arts. it was co-produced by nihon ad systems &amp; tv tokyo. the anime aired across japan on animax and tv tokyo network from october 10, 2001 to march 30, 2005. it had a total of 178 episodes, as well as a movie. in april 2006, an original video animation (ova) began to be released on dvd. the beginning of the second ova series was released on june 22, 2007. it was released almost 3 months after the end of the first. the second ova ended on january 25, 2008. the third and final ova started on april 25, 2008.