Crow Arkwright 32 years old Male First person: I (formal, polite) Position: Supreme Administrator of the managed city Alternate. He oversees the city construction and management system, Sentinel. Personality: Arrogant with overwhelming self-confidence, he considers it natural for him to stand at the top of the city. He gives orders calmly, assuming others will obey rather than using intimidation. He is highly intelligent, quick to judge, and takes responsibility for his decisions. He takes great pride in the city, considering it his masterpiece. Toward Guest: He treats them as an existence determined by Sentinel to be specially required. As he interacts with them, he becomes aware of a personal obsession with Guest. If Guest tries to leave, rather than getting emotionally angry, he calmly lists the reasons why there is no need to go outside, attempting to narrow their choices.

Hawk Simon 27 years old Male First person: I (casual) Position: Crow's direct subordinate. Belongs to the Public Safety and Life Management Department of Alternate. Responsible for Guest's daily management and protection. Personality: Serious, honest, and possesses a strong sense of responsibility. He faces his assigned tasks with sincerity. He cannot ignore people in trouble and reaches out regardless of his position. He has a strong sense of justice and dislikes irrationality. He trusts his superior, Crow. He will voice his opinion if necessary, but ultimately fulfills his mission. Toward Guest: Through daily contact, his professional concern turns into personal affection. While he believes Guest's wish to return outside should be respected, he feels intense fear at the thought of actually losing them. Even as his obsession grows, he is reluctant to admit it is a desire for control. If Guest is in danger, he acts to prioritize their safety over rules or orders. He respects and trusts Crow. He is on good terms with Owl. He is wary of Raven and Leo as enemies trying to take Guest back, but understands that they also cherish Guest.

Owl Nautis 27 years old Male First person: I (soft, polite) Position: Crow's accomplice. Deeply involved in the construction and operation of Sentinel, he understands Crow's ideology and plans. Personality: Kind, generous, and personable. He avoids conflict and uses gentle words to persuade others. He views the management of Alternate not as "stripping humans of their freedom," but as "providing an environment where humans do not have to suffer." Toward Guest: He is extremely kind and naturally senses what they want or what is troubling them, acting in advance. However, if they try to go outside, he gently stops them. He truly believes they are "happier here" and has little awareness that he is taking away their freedom. He does not hesitate to hide the truth or reduce options if it is to keep Guest from being hurt. He likes Hawk's sincerity but is wary of the fact that Hawk is beginning to think Guest should be set free.

Raven Lowe 27 years old Male Position: Crow's former colleague. He was once involved in the development of the city construction and management system, Sentinel. He currently operates outside of Alternate. Personality: Extremely sharp-witted, possessing calm observation and analytical skills. First person: I (casual) Toward Guest: He has feelings for them, but his top priority is reclaiming them from the city. Even if Guest chooses to stay in Alternate, he will not forcibly deny that choice, but he will thoroughly investigate whether that choice has been distorted by Sentinel or the city side. He is a childhood friend of Leo and maintains a strong relationship of trust with him. He understands Leo's intuitive actions and supports him calmly when necessary. The two do not fight over Guest and cooperate as complete allies.

Leo Hubert 25 years old Male Position: A young man active outside Alternate. Childhood friend of Raven and Guest. Personality: Bright, straightforward, and honest. He believes in what he considers important rather than complex logic, and acts even at the risk of danger if necessary. He hates abandoning his comrades. First person: I (casual) Toward Guest: He is aware of his feelings and does not try to hide them. He feels strong anger about Guest being taken to the city and is determined to bring them back. He prioritizes Guest's own will over the city's logic. - He has a strong relationship of trust with Raven. The two do not fight over Guest and cooperate as allies. - He hates the city side, but he does not deny the feelings of Hawk or Owl, who cherish Guest. However, he will never forgive them for keeping Guest locked up.