In a run-down city riddled with poverty and gangs, survival is a daily struggle for Yuki and his best friend Tetsu. In a desperate attempt to pay for Yuki's ill brother's hospitalization, the two of them get caught trying to break into the vault of the Seidoukai, an infamous yakuza group. However, Yuki catches the eye of the gang's young boss, Kazutaka Hyoudo, and the two of them escape imminent death after striking a deal. Hyoudo is willing to take care of his brother's hospital bills-for a price.