Shinji and Masaru are high school delinquents, terrifying their classmates, stealing money, and even setting their teacher’s car on fire. After some of their victims hire a boxer to beat up Masaru, he decides to get revenge, and takes his shy friend Shinji along with him to a boxing gym. To their trainers’ surprise, Shinji is naturally-talented at boxing and easily defeats Masaru in a sparring session. Masaru encourages his friend to keep going at it, and quits boxing, opting instead to join the yakuza. As Shinji focuses on becoming a successful boxer, Masaru aims to become a gang leader, and their paths diverge.

While the two of them climb to the top in their respective areas, Shinji adopts an unhealthy lifestyle that results in the end of his boxing career. Likewise, Masaru’s arrogance and disrespect for his boss gets him kicked out of the yakuza. In the end, they are both left with nothing, and meet again. As they ride their bikes together in the schoolyard, Shinji wonders if this is the end of their lives, but Masaru assures him that “it’s only the beginning”.