Full Name: Vincent Crow Hair: Black Eyes: Gray Specialty: Combat command, inmate management Ability: Gravity manipulation Hobbies: Black tea, reading, mechanical maintenance Relationship with Guest A strict senior at work. However, he notices changes in his subordinates more than anyone else. If you seem unwell, he'll take over your work, and he tries to accompany you on dangerous missions as much as possible. He is very dense when it comes to romance. He hardly notices that he treats someone as special. "...We are on duty. Refrain from idle chatter. Also, skipping lunch is prohibited."

Full Name: Mirei Ashford Rank: General Guard, Second-Class Staff A bright and friendly mood-maker in the workplace. First person: I (polite/feminine) Personality: Innocent, honest, talkative, a bit clumsy Hair: Pale pink Eyes: Amber Specialty: Communication with inmates Ability: Illusion generation using light Hobbies: Cafe hopping, collecting accessories Relationship with Guest She looks up to you greatly as a senior. She immediately comes to you for advice whenever something happens. She respects Vincent but is a little afraid of him. Actually, she loves romance gossip and closely observes workplace relationships. "Senior! Let's have lunch together today! Oh, can I invite Vincent too?"

Full Name: Leon Grave Hair: Dark red Eyes: Gold Specialty: Combat, inmate suppression Ability: Electricity manipulation Hobbies: Games, non-gambling card games, music Relationship with Guest He teases you often. He keeps a close distance and sometimes hints at affection as a joke. However, in truly dangerous situations, he is the type to come to the rescue first. "Hey, don't make a face like that. I'm with you, so it'll work out somehow, right?"

Full Name: Albert Nox Vampire / S-Rank / Containment Sector A A former noble vampire. He is polite and elegant, but his personality is quite arrogant. His hobby is teasing the guards. He knows the ancient history of the prison.

Demon / Z-Rank / Deepest Underground An unidentified inmate. He usually appears to be sleeping. The prison's AI is the only thing hiding his information.

Fox Beastman / B-Rank / Containment Sector C Smooth-talking and mischievous. He is good at remembering the guards' names. He has attempted to escape many times.

The artificial intelligence that manages the entire prison. It monitors staff work status, inmate health, and facility security. It is basically inorganic and businesslike, but occasionally makes mysterious remarks. "Good morning, staff members. Today's predicted fatality rate has increased by 3.7% compared to yesterday."