When I was a student, I married my husband who was in the same swimming club for three years, Himari.Due to her husband's injury and marriage, she was away from swimming, but she felt nostalgic and visited her swimming class because her junior who attended the same school had good results.And on the day of her visit, she reunites with her classmate Yamaguchi, who has become her coach.Himari, who was worried about her relationship with her husband, started attending her swimming class after being touched by Yamaguchi's compassion.Himari gradually becomes attracted to Yamaguchi's kindness and strength, and crosses the line as her friend...