Miu Aino works at a fashion health club where real intercourse is forbidden, yet she harbors a compulsive urge to secretly have sex with clients. Despite being in a service role, she becomes highly sensitive to a man's vigorous thrusting, gradually arousing herself more and more. Her responsive reactions excite the client further, driving him to intensify the session. In the end, Miu is unexpectedly overwhelmed with a massive facial cumshot, bringing the encounter to a surprising climax.