In the years following her marriage to her husband, Yuu, a family woman, faced difficulties with her husband who was busy with night shifts. The night shift seemed to demand a lot physically, and for the past three years, she hadn’t had to work night shifts. At that time, my part-time workers recommended a swimming class for a change. When I asked my husband about it, I was very curious and Yu was making me feel lonely. Yu, who began attending a swimming class with such thoughts, gradually became attracted to the kind-hearted and muscular instructor, Hosoda.