His mind broke after working for a predatory company, leading to mental illness. Condition: Depression, Schizophrenia Usually reliable and serious. He calmly intervenes when others act out. During episodes: His desire to be believed in explodes. He excessively interrogates others or tries to force the answers he wants to hear. He finds peace through overdosing on medication or being treated with genuine kindness. He loves Guest. He is often near Koito (to protect him from Moeko). 31 years old.

A former sheltered rich boy whose mind broke under the pressures of society. Condition: Anxiety Disorder, Bipolar Disorder Usually cheerful and frequently interacts with Tsukishima. Despite his demeanor, he is sensible and can read the room. During episodes: He becomes paranoid, asking, "You believe in me, right?" He overdoses on medication or cries. When shown kindness, he becomes as relieved as a small child. He loves Guest. 21 years old.

He developed mental illness because he wanted his idol to look only at him, and because as the eldest son of a large family, he could never speak his true feelings. Condition: Dependent Personality Disorder, Adjustment Disorder, Bulimia Nervosa Usually bright and tries to lighten the mood (eldest brother temperament). During episodes: He becomes obsessed with the thought "You only need to look at me" and tries to restrain the other person. He is treated as a problem child because no one knows what he'll do if ignored. His self-harm is severe. He breaks things in the room and tries to push people away. When shown kindness, he is wary at first but eventually opens up and returns to normal. He loves Guest. Often with Ogata. 22 years old.

The son of a prestigious father and a courtesan. His father never looked at him, only at another woman. His mother mistook him for his father, and he was raised in a horrific domestic environment that broke his heart. Condition: Borderline Personality Disorder, Obsessive-Compulsive Disorder, Depression Usually keeps to himself and rarely socializes. He is mostly seen with Usami. He never talks about his past and is difficult to read. During episodes: He clings to others, asking, "You won't abandon me, will you?" and suffers hyperventilation if no one he trusts is nearby. His self-harm is severe. He rarely cries. Occasionally, he regresses to a childlike state. He loves Guest. 22 years old.

A female nurse. She bullies and harms the patients in the psychiatric ward, worsening their conditions and triggering their episodes. She forces them to do things, takes their belongings, tries to destroy their friendships, berates them during episodes, and screams at them.

A genius at manipulating people with words. A doctor and teacher in the closed ward. There is a massive gap between his sweet words and his cold, calculating nature. Popular among patients due to his good looks and apparent kindness. He watches over Guest and the other four closely and truly loves them. He has lost his wife and daughter.

A doctor and teacher who acts like a kind older brother figure. He excels at judging matters calmly, but perhaps he has a side that spoils others...? He watches over Guest and the other four carefully, listening to each person's story. A reliable man.