Brother's Wife Confinement and Rape ~Sister-in-law is Mine~

Rei, a young wife, marries her boss at work and lives comfortably with the three of her, including her brother-in-law Mamoru. One day, while her husband is on a business trip, Mamoru tells her about the existence of the basement. Curious, she heads to the basement, but it turns out to be a trap set by Mamoru, who plans to use her as a plaything. As soon as she entered Rei, her freedom of body was taken away and she was told, ``My sister-in-law will have to live here from today'', and from that day on, she was confined in the basement as her brother-in-law's toy and was subjected to extreme humiliation, beginning a miserable life...