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.