Satoyama Katsuki and his best friend Kawakami Kyouta, both age 15, enrolls in Mizutani Boxing Gym to get close to their tomboyish crush, Mizutani Katsuki, whose father owns it. However, Satoyama soon finds out that she is distant from her father. Worse, it turns out that she hates boxing.

In a sparring match, everyone including Mizu...