One day, Masaru, a classmate of her son, comes to visit Chiemi (45), a housewife who is now in her prime and has a lot of free time and a lot of free time with her husband working away from home. Masaru was taught about sex by Chiemi when he was an adolescent, and he has never been able to forget the pleasure he felt from that past. Chiemi, who is living alone and has a growing desire for carnal knowledge, asks Masaru, who has now become an adult, to teach her again.