When two rival gangs the Nioh and Yasha, stand on the brink of a vicious war, Iwao Fudoh of the Nioh gang gladly sacrifices his son's life in so that the uneasy truce can remain. But when Fudoh decapitates his son, he is unaware that his younger son, Riki, witnesses the horrific event. Ten years later, Riki Fudoh has grown into the coolest kid in school; he is also head of a new type of gang that threatens the established Yakazu groups. With high school and primary school hit-men and assassins. Fudoh takes apart the criminal established on his relentless crusade of vengeance for his brother.