Hitomi is asked by her husband's friend to be a tutor for his son. Hitomi, who can't say no when asked, tutors Koichi, who is currently a repeat student, but Koichi is so preoccupied with Hitomi's breasts that he can't concentrate on his studies. In the end, he says he'll only study if he's allowed to touch her breasts. Hitomi lets Koichi touch her breasts, but his desire gradually escalates...