Crows Zero I (2007)

Suzuran High School is also known as The School of Crows. The biggest clique, Serizawa Army and its boss Tamao Serizawa are challenged by a new student to the school, Genji Takiya. Takiya, son of a yakuza boss, wants to be the school's ace fighter. But at the advice of Ken Katagiri, a low-ranked start-out yakuza, Takiya starts to muster together a gang of his own. And as he grows into a true leader, he must face an ultimate battle with Serizawa's gang.