Kira-chan, a member of a swimming club, decides to get a massage to prevent today's fatigue from carrying over to tomorrow. However, unexpected events unfold as she falls into the hands of a corrupt trainer. Under the pretense of loosening her shoulder blades, the trainer meticulously massages her breasts and private areas, gradually intensifying the stimulation. Realizing resistance is futile, Kira-chan's body honestly responds. Eventually, she actively seeks pleasure, passionately sucking the trainer's cock and begging for the special insertion course. Straddling the trainer, she rides him vigorously, desperately chasing greater ecstasy.