Tsuda, a businessman, unexpectedly encounters his childhood friend Kojima on the subway, who is now a semiprofessional boxer. As their paths intertwine, Tsuda's jealousy ignites suspicions of an affair between Kojima and his fiancée, Hizuru. Tensions escalate after a physical confrontation, prompting Tsuda to embrace boxing as a means of channeling his anger. His intense training leads to a brutal showdown, where personal vendettas and emotional turmoil collide in a violent climax that tests the limits of friendship and loyalty.