Kohinata Minoru, a college student in a sports-focused institution, initially joins the gymnastics team with his friend Nana. However, he faces bullying from superior team members. One night, a karate student named Mutou Ryuuji intervenes not to save Minoru, but to recruit him into the realm of karate. Through this new path, Minoru befriends others with hidden histories, uncovering a tragic death that ignites desires for vengeance.