Wakaba, the daughter of a wealthy family, and Aimi, an ordinary girl from a middle-class family, have been given everything they could ever want since they were little. The two of them were senior and junior at a certain women's university. Time passed and Wakaba rented out the mansion she inherited from her parents to a friend as a share house. Through a mutual friend, Aimi ended up sharing a room with Wakaba, but Aimi didn't know at the time. The reality of the <lesbian training> that was taking place in Wakaba's share house...