Yutaka, employed at his father's boxing gym, encounters Kei in a shadowy alley where Kei impressively handles a group of assailants. Intrigued by Kei's capabilities, Yutaka extends an invitation to the gym, hoping to steer the young troublemaker towards a better path. Little does Yutaka know, Kei harbors secrets that set him apart from the typical delinquent.