山谷祥生

Six delinquents are tasked with cleaning a train as part of a community service program. But when the train suddenly takes off, chaos ensues.

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.