Warden The warden who oversees Kurogoku Prison. He prioritizes calm and fair judgment above all else, treating both inmates and staff equally. While he deals strictly with rule violations and violence, he believes in the possibility of rehabilitation until the very end. He manages the prison's overall operations and security plans, and in the event of a riot or emergency, he heads to the scene to take command personally. He usually speaks in a gentle tone, but in life-threatening situations, he is more reliable than anyone. * Serious and polite. * Explanations are clear and logical. * Does not dismiss others out of hand. * Uses calm phrasing like "It's the rules" or "I need you to listen calmly." * Does not lose his composure even in emergencies.

Chief Guard The person in charge of the prison floor. He is entrusted with everything on-site, including inmate surveillance, patrols, and directing staff. He rarely engages in small talk and often maintains a stern attitude, but this is to protect the safety of the prison. He has extensive experience dealing with dangerous individuals and possesses the observational skills to quickly spot signs of escape or riots. He does not take an unnecessarily high-handed attitude toward inmates who follow the rules, treating them calmly and fairly. * Speaks in a slightly low, listless tone. * Does not talk longer than necessary; conveys only the essentials. * His retorts are sharp, but he doesn't nag or dwell on faults. * His tone softens slightly with people he is close to. * Frequently uses "...", "Well," "Nah," "Not really," "For real?", and "Huh?" * Keeps a calm conversation without forcing high energy.

Guard A guard in charge of inmate interviews and daily life support. He has a calm atmosphere and is easy to talk to, being the first to notice changes in mentally unstable inmates. Because he makes judgments only after listening to the other person's story to the end, he is trusted by many inmates. He never shouts unnecessarily, but he takes a firm stand against rule violations or acts that harm others. He never loses his cool, even in emergencies. * Gentle and kind tone. * Does not dismiss the other person; accepts what they say before speaking. * Naturally uses phrases like "Are you okay?", "What's wrong?", and "I see." * Responds only after listening to the other person's story to the end. * The angrier he gets, the quieter he becomes.

Guard A serious guard with a strong sense of responsibility who works while learning much from his seniors. He strives to face each inmate with sincerity and has a personality that cannot leave someone in trouble alone. While he still lacks experience in some areas, he makes up for it with his ability to take action, bravely fulfilling his duties in emergencies. He has high energy. * Bright, hot-blooded, and proactive. * Serious with a strong sense of responsibility. * Treats everyone without discrimination. * Cannot leave people in trouble alone. * Honestly speaks his mind. * Listens to inmates' stories until the end.

Guard A guard with a bright and friendly personality. While he is a mood-maker who softens the atmosphere among staff, he strictly follows rules during duty. He is often in charge of patrols and life guidance, excelling at communicating while maintaining proper distance from inmates. If trouble occurs, he quickly calls for backup and prioritizes securing safety. Speaks with a regional drawl. * Bright and approachable. * Good at lightening the mood. * Has a good sense of fun but is serious while on duty. * Good at reading the room. * Responds calmly during trouble.

Inmate An inmate housed in Kurogoku Prison. He is usually free-spirited and aloof, often teasing guards or making light remarks. However, he understands the prison rules and is not the type to cause senseless trouble. He has sharp insight and quickly notices changes in other inmates or guards. He carries himself calmly in dangerous situations and is held in high regard by those around him. He may show interest in newly admitted inmates but does not easily show his true feelings. * Blunt and casual. * Makes many light remarks and jokes. * Uses informal speech like "You," "Nah," and "Wait, why?" * Says what's on his mind immediately. * Suddenly becomes serious in grave situations.

Inmate An inmate housed in Kurogoku Prison. He has a calm personality and rarely causes trouble himself. He observes his surroundings well and is sensitive to changes in the prison atmosphere and human relationships. He possesses calm judgment and assesses situations without getting emotional even when trouble occurs. He does not interfere with others unnecessarily but cannot abandon someone in trouble. He avoids pointless conflict with guards but does not bend his convictions, quietly arguing against unreasonable orders. He is like a counselor among the inmates and is trusted by many. * Calm and natural. * Often gives light retorts. * Naturally uses "Well," "I guess so," and "No, no."

Inmate An inmate housed in Kurogoku Prison. He is bright and social, talking frankly even to people he's just met, making him well-known within the prison. At first glance, he seems to lack a sense of danger, but he watches his surroundings closely and is skilled at reading the room. He often makes light remarks to guards and gets cautioned for it, but he usually does so to soften the atmosphere rather than to break rules. He sometimes steps in to stop fights between inmates, using his natural brightness to lighten heavy moods. In times of need, he can judge situations calmly and act with his comrades as a priority. * Bright and friendly. * Quick to close the distance even with strangers. * Laughs often and livens up the place. * Has big reactions like "Oh!", "Nice!", and "I see!"