In a run-down city beset 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 brother's hospitalization, the two of them get caught trying to break into a yakuza vault. But the gang's young boss, Kazutaka Hyoudo, takes an interest in Yuki and they strike a deal: Hyoudo is willing to take care of the hospital bills— for a price.

A weekly visit to the Seidoukai office doesn't seem like much to pay, but the boys' connection to the criminal group has already begun to draw the wrong kind of attention. When a shady, malicious figure from Yuki's past reappears in his life, painful secrets are revealed and hard decisions must be made. Can Tetsu overcome the shock of learning about Yuki's dark past to express his deep and unwavering love for his friend?