A few years after marrying her husband, married woman Yu had troubles with her husband who was busy with night shift work. 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, she seemed uninterested, and Yuu felt her loneliness even more. With this thought in mind, Yuu begins attending her swimming class, and is gradually drawn to Hosoda's honest heart and muscular body.
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