Welcome to a world where violence is a virtue and depravity is a way of life. This is the underside of Shinjuku, and the home of Kakihara, a sadistic Yakuza killer. He relentlessly tears apart the underworld searching for the man who killed his boss. The mastermind behind the plot is Jijii, an ex-cop bent on the turning the gangsters of Japan against one another. His trump card is a physically powerful lunatic who is constantly on the verge of snapping. This madman is Ichi the killer, and between him and Kakihara, the streets will run red with blood.