Aoi, a married woman of three years, felt lonely facing her husband's cold attitude, which was far from his initial kindness. While shopping for dinner with her troubles weighing on her mind, she happened to run into her classmate from student days, Hosoda. Learning that Hosoda worked at a swimming school, Aoi accepted his invitation to observe and decided to start attending the swimming classes. Each time she went to the swimming school, Aoi found herself drawn to Hosoda's kindness as he encouraged her about her troubles with her husband. Then one day, when her frustrations with her husband boiled over, Aoi crossed the line with Hosoda...
