Amai Choubatsu: Watashi wa Kanshu Sen'you Pet

The story is set in a prison in the near future. It revolves around Saotome Hina, imprisoned despite her innocence, and the elegant yet sadistic guard Miyoujin Aki. Hina's heart and body are at the mercy of Myojin's "heartless yet sweet domination" from physical examinations to lovers' prison visits.