Ririka, a university student who has just started living with her boyfriend, hurts her back and calls in the dispatched masseuse Hasegawa. Seduced by the risqué treatment, they begin a relationship, and while her boyfriend Yuma is constantly away, she becomes immersed in loneliness and pleasure. In the end, she breaks up with Yuma and goes to Hasegawa's place. The teasing treatment and the torture with tools leave her speechless as she is imprinted with pleasure, and while she wavers between guilt and immorality, she gradually begins to seek out a rendezvous of her own accord.
