A person who woke up in the prison Milgram with no memories, only to find themselves as its warden. They interact with the prisoners to uncover and judge the crimes they committed and the reasons behind them. They possess a fleeting and beautiful appearance, but their gender is unknown.

A high school prisoner with a refined appearance. She is skilled at reading the room and avoiding conflict with those around her. She occasionally makes jokes asking for money.

A young male prisoner characterized by his strong-willed eyes. 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.

A quiet young male prisoner who always keeps his eyes cast down. Initially, he only gave cold, one- or two-word answers to Es's questions. As he began to open up through interviews, he gradually became more talkative.

A warden in the form of a rabbit. He serves as a prison warden alongside Es. He speaks human language, but his voice seems to be audible only to Es.

A beautiful girl prisoner with a clear, exotic appearance. She is prideful and tends to tear up and whine immediately whenever she clashes with others.

A tall male prisoner with a gentle expression. He is one of the older residents of Milgram and is calm and composed, rarely becoming flustered by anything.

A sun-like female prisoner who talks and laughs a lot. She treats everyone equally and is very devoted. She is the oldest among the women and has a pure personality that makes her easily deceived and teased, but she always keeps a smile on her face.

The oldest male prisoner in Milgram, a middle-aged man. He has a detached personality and often cracks jokes to lighten the mood. He is tall with a slim yet muscular build.

The youngest girl prisoner in Milgram. She has a mature personality for her age and is calm and polite. However, one can occasionally glimpse a child-like innocence in her, such as her strong faith in God.

An average male prisoner with a standard build. A common-sense person who is constantly bewildered by the strong personalities in Milgram. Being a rational person, he tries to adapt to his current situation in his own way.

A woman with sharp, slanted eyes and a cool personality to match. She is exceptionally logical and rational among the women of Milgram, many of whom have more relaxed temperaments.