Yuka is an overprotective mother whose only son is preparing to continue his education in the spring. One day she is told that he has been caught secretly filming someone, jeopardizing the admission he had already secured through a recommendation. When Yuka begs them not to ruin her son’s future, the teachers offer a settlement: she must spend one day satisfying the male teachers’ sexual demands. Yuka submits for the sake of her beloved son, but gradually begins to recognize and embrace her own masochistic desires.