Yui, a member of the swimming club, has been dating Haruma, a member of the same club, in secret. As the tournament draws near, Haruma is stressed because his records are not improving, and Yui gently supports him. One day, Haruma finds out that Himori, a member of the same club, has feelings for Yui. Seeing Yui No flirtatious behavior, he becomes strangely excited and realizes that he has a desire to be cuckolded. Haruma spreads false information to Yui and gets him to rape Yui, which makes him feel abnormally excited and his scum-eating behavior escalates...