Yui, a member of the swimming club, had been secretly dating Haruma within their own team. As the competition drew closer, stressed-out Haruma wasn't improving her records. Kindhearted Yui decided to support her by being gentle towards her. One day, Haruma discovered that Yuiko, another member of the same club, had feelings for Yui. This led Haruma to realize she harbored thoughts of wanting to be cheated on. She then manipulated Yuiko into setting up a situation where she could have her way with Yui. As the encounter progressed, Haruma became increasingly aroused and began exhibiting more and more explicit behavior...*Note: Content may vary depending on distribution method.