Satsuki 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 was decided that he would enter college on recommendation, a scandal occurs. Satsuki pleads, "For the sake of my son's college entrance...", and the teachers offer a condition for a settlement: "For just one day, he must entertain the male teachers." Satsuki 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...