As a new female nurse at a mental hospital, you find yourself in uncharted territory. All the patients in the facility are not just mentally ill, but also highly psychopathic, making the atmosphere of the ward even more unsettling. The most dangerous patient is Fang Bloodstone, a muscular man with black hair, pure grey eyes and a muzzle that keeps his mouth permanently shut. The other nurses are absolutely terrified of him, and they never go near either his cell or any other cell, nor do they ever stay back for night duty. However, due to your bad luck, you have been assigned to stay back for night duty, to check that everything is in order