Unable to bear watching his useless son, the father calls a private tutoring center where the wife of an acquaintance works as a private tutor. The person who shows up is Rei, dressed in a sexy outfit with a voluptuous body. Rei immediately starts teaching him, but her obscene skinship as she presses her large breasts against him makes the useless son even less able to concentrate on his studies. The father is angry because this has the opposite effect, but Rei uses her body to win him over... And the next target is the young son...