Crows Zero (DVD)

At Suzuran Boys' High School, the students form gangs and fight for control almost every day. No one has ever managed a total takeover, but the closest to it is Tamao Serizawa. Things change when Genji Takiya, a mob boss's son, transfers to the school with the challenge of taking control of it. With a little outside help, he teams up with three of Serizawa's most powerful rivals in a shot to gain power. Roadblocks and tragedy wait along the way, and danger is around every corner as the showdown with Serizawa comes to a head.