Mio Ichijo, a resident of an apartment building, brings a man into the house while her husband is away and has an affair. One day, the manager, Sugiura, becomes suspicious of Mio's behavior and watches Mio affair. He takes pictures of Mio, who is tied up, trained in SM, and creampied, becoming lustful. The manager uses the photos to blackmail Mio and trains her to be his deep throat sex slave. Furthermore, Sanada, Mio's lover, moves into the same apartment building and begins to train her in deep throat while Mio husband is away.