Yumi has recently started going to swimming lessons to overcome her fear of swimming, but all the other students are male, and Yumi is somehow worried about the men's gazes. Since she can't swim at all, the teacher teaches her step by step, but the ripe body that spills out of the competitive swimsuit is too erotic, and the lesson becomes something like sexual harassment! From that day on, men flock around Yumi, and they repeatedly sexually harass her in every way possible...