The Black Cat | manga series

Black Cat (ブラックキャット, Burakku Katto) is a Japanese manga series written and illustrated by Kentaro Yabuki. It was originally serialized in Japan in Shueisha's Weekly Shōnen Jump. It was later collected in twenty volumes from January 11, 2001 to October 9, 2004. The series was adapted into a twenty-four episode anime series by Gonzo studio. It debuted in Japan on the anime satellite television network Animax and the terrestrial Tokyo Broadcasting System network on October 6, 2005 with its final episode airing on March 30, 2006. 

http://www.youtube.com/watch?v=mdi-oJOrk94