Onejo Mio, a resident of the apartment building, was having an affair with another man while her husband was away. Suspecting Mio's suspicious behavior one day, the building manager, Sugiura, secretly observed her romantic trysts. He captured photos of Mio restrained, undergoing SM training, being ejaculated inside, and aroused. Using these photos, the manager coerced Mio into becoming his obedient sex slave. Additionally, Mio's affair partner, Sanada, moved into the same apartment building and continued the sexual training sessions while Mio's husband was away.
