While her parents are away on a trip, Noriko, a housewife living next door, is asked to keep an eye on her son (Yuji), who is retaking the exam to get into medical school, so that he doesn't slack off. She ends up spending all her time with Yuuji... However, Noriko is annoyed by Yuuji's inability to concentrate, and begins to provoke the young Yuuji to relieve her sexual desire, which is not satisfied by her husband...