After being unjustly imprisoned at Kokuyoku Prison, Hina Saotome encounters the enigmatic warden, Aki Myoujin, whose charming facade masks a sinister side. As she grapples with his tyrannical rule and peculiar penalties, Hina finds herself captivated by his allure. Trapped within the confines of the prison, she yearns for liberation, yet as she delves deeper, she discovers a complex web of desire and mystery surrounding Aki's motives.