The central character in the narrative is Shingo Chiryu, a 16-year-old boy who was severely beaten and had to be hospitalized for a month by an obese girl who had expressed her feelings for him in the nude but was rejected. This incident has resulted in Shingo developing a fear of women which is known as gynophobia. Although Shingo attempts to conceal his phobia, the school nurse notices it and recommends that he join the boxing club. However, Shingo discovers that the boxing club is comprised of only female members, the school nurse serves as the adviser, and the girl who had previously injured him, Haruka Nishiharu, is now slender and part of the club.
