Meguri, a beautiful big-breasted housewife, feels no pleasure from sex—her nightly encounters with her husband are merely performances to avoid disappointing him. However, as her desire for intimacy with her husband, parents, and child grows and sexual frequency increases, Meguri becomes increasingly troubled. Unaware of her emotional state, her husband suggests she visit a friend's massage clinic to boost her spirits. This recommendation leads Meguri down a path of repeated cervix-stimulated convulsive orgasms, transforming her into a lustful, depraved woman.