Nabari no Ou
隠の王 (original)
In the shadows of this modern world, ninjas fight for control of an ancient technique which holds untold strength. This coveted power dwells within apathetic Miharu, a fact the guy really couldn't care less about - until the clashing rival clans bring their battle to him. Now Miharu struggles to understand the mystery buried in his soul, and must choose a side if he hopes to survive.
Starring Satoshi Hino, Ayumi Fujimura, Mitsuki Saiga, Rie Kugimiya, Daisuke Namikawa, Ryotaro Okiayu, Akeno Watanabe, Kimiko Koyama, Jouji Nakata, Yuri Amano
Watch "Nabari no Ou" on Amazon released in 2008. It's a animation and drama show, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of show.