[Mosaic Removal] A few years after getting married to her husband, Yuu had troubles with her husband who was busy working the night shift.It seems that the night shift is physically demanding, and for the past three years, there has been no night work at all.At that time, her part-time mate recommends a swimming class for a change of pace.When she consulted her husband about it, he seemed uninterested, and Yu was feeling even more lonely than her.With that thought in mind, Yuu begins attending swimming lessons, and is gradually drawn to the honest heart of Hosoda, the young instructor, and her muscular body.