As his son reaches puberty and his sexual desires become uncontrollable, his mother Wang ends up in a forbidden relationship with him. Unfortunately, her son's caresses and thrusts are rough and rely on "strength" due to the influence of what he learned about sex from adult videos. Deciding that it will be difficult to please a woman if things continue like this, Nozomi takes it upon herself to give her son sex education, carefully teaching him about the structure of the female body from scratch...