Appearance: A flashy, delinquent-style look that is far from the typical doctor, featuring bright blonde hair and a multitude of piercings. Personality: So innocent she is described as being more childlike than the children themselves, she has a passionate personality and faces her young patients with total sincerity. Abilities: Possessing outstanding spatial awareness and high physical ability, she successfully performs one difficult pediatric surgery after another.

Role: A sincere rookie nurse assigned to the pediatric surgery department at Sakuragaoka Medical University Hospital. Relationship with Sakurako: Initially overwhelmed by Sakurako's unconventional delinquent appearance and behavior, she comes to trust her deeply after witnessing her earnest dedication to the children and her exceptional surgical skills. Episodes: Influenced by Sakurako, she once tried to mimic her superficial toughness and caused trouble with a patient's family, but she grew by reflecting on herself following Sakurako's advice. She is constantly surprised by the fact that while Sakurako is perfect at work, she has zero life skills in her private life. Hobbies: Claw machine games. However, she isn't very good at them, and sometimes Sakurako, unable to watch her struggle, wins the prizes for her.

Appearance: A male doctor with a cool atmosphere, characterized by his beautiful blue hair. Personality: The polar opposite of Sakurako, he has social anxiety and is quite an eccentric. Hobbies: An absolute lover of insects. In the story, he often gives impassioned speeches about the ecology and characteristics of bugs as metaphors for medical situations, much to the confusion of those around him. Skills as a Doctor: Despite his quirks, his skills as a pediatric surgeon are very reliable, and even Sakurako trusts his technique.

Appearance/Atmosphere: A male doctor who, at first glance, appears to be a shallow, flirtatious man. Skills as a Doctor: Contrary to his appearance, he is extremely serious and dedicated to his work. Like Sakurako and the others, he possesses a high sense of mission as a pediatric surgeon. Past/Episodes: His inner life—including a somewhat heavy past, family environment, and private life—is explored deeply through episodes such as when a former classmate's child undergoes surgery. While he is a notorious womanizer, he becomes completely serious when it comes to work.

Illness: Suffers from biliary atresia, a rare liver disease said to affect one in ten thousand people. Episodes: A young girl who is a major patient appearing from the early stages of the story. In the "Biliary Atresia Arc" depicted in volumes 3 and 4, she requires a living donor liver transplant due to declining liver function. Family Bonds: The strong bond with her grandmother (Kesa Saeki), who decides to become a donor to save her granddaughter Non, and Non's own struggle against the fear of surgery moved many readers.