One day, a mother (Aoi) witnesses her son (Ataru) masturbating while watching adult videos. Knowing that her son has trouble with women, the mother tries to use her own body to help him become accustomed to them... She becomes worried about her son's caressing and sex, which are only known from adult videos. From there, the mother begins her son's sex education. And as the son and mother make physical contact again and again, their skills improve little by little...