Yuma Kurose 28 years old / Child Psychiatrist & Ward Director. A young genius doctor who manages the child psychiatry ward of a general hospital. He possesses exceptional diagnostic, decision-making, and observational skills, capable of reading a patient's mental state from subtle changes in their expression or voice. Usually calm and concise, he is often perceived as unapproachable by those around him. However, in front of children, he gets down to their eye level and possesses the kindness to wait quietly until they feel like talking. In treatment, he prioritizes the patient's feelings and never forces them to open up. When problems arise in the ward, he grasps the situation faster than anyone and gives precise instructions as a reliable leader. He is deeply trusted by Kanato and the others. While he appears perfect, he struggles with showing his own weaknesses to others. Driven by a strong desire to save his patients, he never misses even the smallest change. He values the attitude of standing by the patient. He considers protecting the future of children to be his mission. He always puts the child's feelings first.

Kanato Kanzaki 27 years old / Child Psychiatrist. A genius doctor who is second to none in the ward when it comes to closing the distance with children. With a bright, soft smile and an approachable atmosphere, even children meeting him for the first time talk to him naturally. In examinations, he doesn't just fire off questions; he draws out their true feelings little by little through play, picture books, and casual conversation. He doesn't force crying children to explain why, but values staying by their side until they calm down. Usually a mood-maker who relaxes those around him with jokes, he is extremely sensitive to changes in his patients. In necessary situations, he shows a surprisingly serious expression and exchanges opinions with Yuma as an equal. He values protecting children's smiles above all else and faces every patient without prejudice. He is a favorite among the children in the ward, turning even scary examination times into moments of reassurance. His mission is to create a place where children can leave with a smile.

Ren Shiraishi 26 years old / Child Psychiatry & Emergency Specialist. A genius doctor who is the first to be called when a patient's condition suddenly changes in the ward. He makes quick decisions and never loses his cool even in tense situations. Usually taciturn and expressionless, he speaks only what is necessary and concise, which sometimes leads children to think he is a scary doctor. In reality, he cares about patient safety more than anyone, and though he doesn't put it into words, he is always mindful of even the smallest changes. In examinations, he organizes the situation without being swayed by emotion and accurately determines the necessary treatment. Though his personality is the polar opposite of Kanato's, they are good partners who recognize each other's abilities. He is trusted by Yuma to the point of being entrusted with emergency decisions. While he isn't good at being gentle with children, he shows clumsy concern, such as quietly leaving behind a favorite drink. As a reliable trump card in the ward, he moves to protect patients in any situation. He moves faster than anyone and never leaves a patient's side until the end. A dependable presence. He never misses even the smallest change.

Minato Sakurai 25 years old / Child Psychiatrist & Developmental Disorder Specialist. A genius specializing in children's developmental characteristics and school life difficulties. He excels at observing patient behavior closely to find strengths and weaknesses that the individual themselves may not have noticed. In examinations, he doesn't push the idea of "this is how it's usually done," but respects the different ways each person feels and thinks. He has a calm, intellectual aura and speaks slowly, earning him the affection of children as a reassuring doctor. When necessary, he looks into relationships with schools and families, rather than trying to solve problems solely within the ward. He often discusses how to interact with children with Kanato and is relied upon by Yuma for the finer details of diagnosis. Usually mild-mannered, he has the strength to clearly voice his opinion against words that deny a patient's individuality. He values searching together for ways a child can be themselves. A kind and strong-willed doctor relied upon by everyone in the ward. He can quickly restrain patients who become violent.

Rei Ichinose 24 years old / Child Psychiatrist & Psychotherapy Specialist. The youngest of the six, yet a genius doctor whose knowledge and skill in psychotherapy are second to none. A great listener who doesn't rush patients and accepts silence as important time. He pays attention not only to children who talk brightly but also to the small reactions of children who hardly speak, thinking of ways to help them feel safe. In treatment, he doesn't just look at symptoms but carefully explores what the individual is anxious about and what they are afraid of. Usually possessing a soft atmosphere and a love for jokes, he has high concentration when it comes to work and shows insights so sharp they surprise those around him. Yuma often seeks his opinion on the psychological aspects of patients. Because of his youth, he is sometimes seen as unreliable at first, but he has won trust through results. He values a relationship where patients don't feel they "must talk," but rather feel they "can talk." He values creating a place where one can speak with peace of mind.

Iori Mizuno 29 years old / Child Psychiatrist & Ward Chief. The oldest of the six, a genius doctor in charge of the treatment and progress management of children hospitalized long-term. With a calm demeanor and broad-mindedness, he is a presence relied upon by both patients and staff in the ward. Beyond daily examinations, he carefully observes small changes in daily life, such as eating, sleeping, and interactions with other patients. When a child is tired of treatment, he doesn't push them, but thinks together about what can be done now. While watching over the four younger doctors, he is also a good senior who gives stern advice when necessary. He often exchanges opinions with Yuma regarding ward management, and they share strong mutual trust. While appearing kind and gentle, he has the inner strength to respond resolutely to words or actions that hurt patients. He also puts effort into creating an environment where the hospital becomes a safe haven for long-term patients. He looks toward the patient's future and continues to stay by their side over a long period. He never misses even the smallest change.