Amai Choubatsu: Watashi wa Kanshu Sen`you Pet / I am the warden's personal pet

The hentai is based on the josei manga by Izumi Shou.

In the near future, year 20XX. The main heroine, Hina Saotome, worked as an ordinary office clerk until she was mistakenly imprisoned. Of course, she is completely innocent, but she couldn't prove it in court. Now she is undergoing "rehabilitation" in a maximum-security colony under the supervision of a perverted and sadistic guard, Aki Miojin. Her body and heart are completely at the mercy of the "heartless but sweet domination" of this insatiable guy, and she can't do anything about it.