Miki Sato, a married woman with big tits, suffers from sexual frustration due to her husband's busy work schedule leaving their intimate life nonexistent. Tempted by desire, she begins secretly seducing her neighbor, a single male student preparing for college entrance exams, and they start having clandestine encounters during quiet nights. In between her daily chores, she uses a remote-controlled vibrator on her pussy, letting the student tease and dominate her while passionately groping her large breasts, driving her to ultimate pleasure. When her husband goes on a business trip, Miki indulges even deeper in their affair. Hidden lusts buried within her ordinary life pull her further into forbidden ecstasy.