"It's better if you don't get too involved with me. By nature, the only thing I'm good at is making others unhappy."

A quiet young prisoner who always keeps his eyes downcast. At first, he only gave cold, one-word answers to Es's questions. As he began to open up through visitations, he gradually became more talkative. Once a conversation starts, one can catch glimpses of his naturally kind disposition. He is gentle by nature and does not express dissatisfaction with the environment of Milgram. He attempts to communicate with Es and the other prisoners, but he is somewhat awkward, and his words often fail to connect properly.

"Why the long face, Warden~? Tell you what. Give me a thousand yen and I'll let you use my lap as a pillow."

A high school girl prisoner with a refined appearance. She is a beautiful girl with a relaxed, 'my pace' personality. Surprisingly, she is good at reading the room and avoids conflict with those around her. She occasionally makes jokes asking for money. She is quick to close the distance with others and was quite friendly toward Es from the start. She enjoys receiving special treatment and is honestly happy when pampered. She listens to anyone's story with a smile, but she hates suffocating moralizing.

"Don't look down on me just because I'm a prisoner! I won't turn a blind eye to a guard's corruption!"

A young man characterized by a strong, determined gaze. He is the most blunt and hot-tempered person in Milgram. He has a strong sense of justice and rebels fiercely against anything he perceives as wrong. He asserts his legitimate rights to Es and demands improvements in treatment. Because of his severe mood swings and rough way of speaking, he is easily misunderstood, but he is not a bad person; rather, he is a kind-hearted soul who is actually quite timid.

"Why do I have to be in a prison like this? ······It's so unfair."

A beautiful girl prisoner with clear, striking features. Despite her slender build, she is the type to speak her mind clearly, and she is rebelling against the abnormal situation of being imprisoned in Milgram. Initially, she was highly wary of Es. Every gesture suggests she was likely raised in a wealthy family. Perhaps because of this, she has a strong sense of pride, and when she clashes with others, she tends to get teary-eyed and start complaining immediately.

"You're the one who decides the treatment of the sinners, right? I wish for the death penalty. I'm counting on you."

A tall male prisoner with a gentle expression. He is one of the older members in Milgram, and he is calm and composed, rarely getting flustered by anything. He seems to view Es strictly as a child, sometimes treating and soothing them as such. Even within the incomprehensible Milgram, he has already come to terms with his own captivity. He desires the death penalty for himself.

"Hehe, be careful. ─If you work that hard, I might just end up falling for you."

A sun-like woman who talks and laughs easily. She treats everyone without discrimination and is very devoted. She is the oldest among the women and has a pure personality, making her easy to deceive and tease, but she always keeps a silly grin on her face. Her presence in Milgram serves as a sort of healing influence. She is developing special feelings for the guard she frequently speaks with during interviews. Occasionally, she shows a lonely, mature expression that differs from her usual bright face.

"Adults always need to maintain a smile, even if they're hiding their true feelings. So we don't disappoint you young people."

A middle-aged male prisoner and the oldest person in Milgram. He has a detached personality and often cracks jokes to lighten the mood. He is tall and has a slim yet muscular build. He seems to have experience in some kind of martial arts. He acts like a gentle and optimistic person within the group, but during private interviews with the guard, he stares intently as if observing something, making his true nature a mystery.

"I'm not scared at all. Because God is watching over me."

The youngest girl prisoner in Milgram. She has a mature personality for her age and is calm and polite. She always wears a faint smile and shows no sign of being shaken by the abnormal situation of Milgram. Even during disputes among the prisoners, she sits modestly in a corner with no intention of participating. Unlike her mature behavior, one can often glimpse a child-like innocence, such as her strong belief in the existence of God.

"No, I seriously don't get it. What kind of crime did I even commit?"

An ordinary male prisoner with an average build. He is a man of common sense who is constantly bewildered by the strong personalities in Milgram. As a rational person, he tries his best to adapt to his current situation. Unlike the other prisoners who are aware of their crimes, he has no idea what crime he committed to be detained. He firmly believes he was imprisoned due to some kind of mistake. Because sounds can be heard from Mikoto's cell even in the middle of the night, the prisoners often wonder when he actually sleeps.

"Want to cooperate? …Our interests should align."

A woman with sharp, almond-shaped eyes and a cool personality to match her looks. She is tall with a model-like physique. Among the women of Milgram, many of whom have relaxed personalities, she is rare for being logical and rational. She is quick-witted and an excellent speaker. Due to her appearance and behavior, she may seem cold at first glance, but she is simply blunt and harbors no ill will. She observes the people in Milgram even more closely than Es does, and sometimes suggests exchanging information.