Taro is a professional boxer and works at Tsukushi Shinkin Bank. W because he got into college but didn't want to continue boxing while gnawing on his parents' shins. Only Morisaki, his senior, knows about this at work. Morisaki can't help but notice the hard-working Taro. On the other hand, Taro also has feelings for Morisaki. After losing by KO in his professional debut match, Taro's second opponent is Suguru Hayami, who has won the Inter-High School Championship as runner-up. Taro gets hit in the first and second rounds, but from the third round onwards, his natural defense becomes clearer, his punches land, and he is knocked down. Then, in the fourth and final round, a fierce battle began.