A young and beautiful mother, Haruki, and her son, Shiro, can be seen as a couple from the outside, and they can talk about anything. However, even in such a parent-child relationship, my son, who has entered puberty, cannot talk about 'sex'. One day, his homeroom teacher informs him that Shiro brought an AV to school and became a problem. Haruki is troubled and decides to use her own body as her mother to teach her son about sex, her female body. At first she is a bewildered son, but fascinated by the touch of her mother's lips, her young and firm breasts, and finally by her forbidden brush down, comes to know a woman's body.
