After a parent-teacher conference at school, Kyoko Takashima is told by her son's teacher that "your son is behind in sexual knowledge." Deeply shocked by the comment, she becomes intensely worried that her son might embarrass himself if he ever gets a girlfriend. That night, she decides to take matters into her own hands and begins giving him sex education. Starting with watching adult videos together, she carefully teaches him about erections, masturbation techniques, and the female anatomy. Her son responds well, gradually gaining understanding. Will Kyoko's loving dedication and effort lead to her son's healthy development?