Department head Nenji is a man married to Natsuki, a slender and elegant Kyoto beauty. One day, he invites two of his subordinates to his home for a dinner party with his wife. However, when Hashimoto gets lost on the way, Nenji leaves to pick him up, leaving his wife Natsuki alone with another subordinate, Harada. Taking the opportunity, Natsuki—who hasn't seen Harada in a while—suddenly becomes aggressive, seducing him and passionately sucking his cock. Later, when Hashimoto finally arrives at the department head's house, he discovers Natsuki secretly having an affair with Section Chief Oda. This revelation triggers a series of intense and escalating sexual encounters among the group.