Yuko has an only son who is about to enter college in the spring. Out of love, she has been overprotective of her son, but one day she receives a call that her son has taken secret photos... Just when it had been decided that he would enter college on recommendation, a scandal occurs. Yuko pleads with the teachers, saying, "For the sake of my son's education...", and they offer a condition for a settlement: "She must entertain the male teachers for just one day." Yuko does as they say for the sake of her beloved son, but before she knows it, she begins to become aware of her own masochism...