KATSU!

Two 15-year-old boys, Satoyama Katsuki and Kawakami Kyouta, join a boxing gym to get closer to their crush, Mizutani Katsuki, the tomboyish daughter of the gym's owner. Satoyama discovers that she is estranged from her father and dislikes boxing, despite secretly loving it. He reveals unexpected boxing talent during a sparring match, prompting Mizutani to become his trainer, aiming to help him win a championship. Satoyama agrees, hoping to spend more time with her. The narrative later reveals Satoyama has a hidden background and heritage that could make him a top boxing champion.