Sweet Punishment: I'm the Guard's Personal Pet (2018)
Original title: 甘い懲罰～私は看守専用ペット
Sweet Punishment: I'm the Guard's Personal Pet is a 2018 Japanese-language animation series. It stars Yoshitaka Yamaya, Marie Miyake and Yoshiki Nakajima.
The story is set in a prison in the near future. It revolves around Hina Saotome, imprisoned despite her innocence, and the elegant yet sadistic guard Aki Myoujin. Hina's heart and body are at the mercy of Myoujin's "heartless yet sweet domination" from physical examinations to lovers' prison visits.