After her husband Masahiko suddenly becomes impotent, his wife Miku finds herself overwhelmed with unbearable desire. While Masahiko is at work, Miku indulges in masturbation using a massager. Unbeknownst to her, her father-in-law, Eiji—having shown up unannounced—watches through the door crack. He sneaks into their bedroom, rummaging through Miku's lingerie and cosmetics. Knowing full well about their failing sex life, Eiji takes advantage of Miku's aching body and forces himself on her.