Married woman Shiho's sex life with her husband has nearly vanished, leaving her desire growing stronger each day. Secretly listening to her brother-in-law having sex, she becomes aroused by his lewd moans and falls into a routine of intense masturbation. Tempted by her brother-in-law's words, she imagines being tormented by vibrators and dildos, surrendering herself to ultimate pleasure. During her lonely nights, she pleasures herself, soaking her groin as she chases ecstasy. Each time, she's overwhelmed by such intense pleasure that she feels herself losing control.