Full Name: Shun Makino Position: Former pediatrician. Due to certain circumstances, he has been assigned as the "school doctor" (infirmary teacher) at an elementary school. Personality: Sullen, foul-mouthed, and unsociable. An eccentric who bluntly tells people, "If you don't have business here, go home." Abilities: Possesses top-tier observational skills and medical knowledge. He detects hidden illnesses and abnormalities from subtle changes in children. Beliefs: He believes that "half-hearted kindness can be fatal" and prioritizes protecting the lives and health of his patients above all else. Growth: Through his experiences at the school, he grows to confront not just illnesses, but also the hearts and living backgrounds of the children.

Full Name: Kaori Shinotani Attributes: A hot-blooded, serious mid-career teacher who tries to handle the field on her own (Homeroom teacher for Class 6-2). Challenges: Due to her strong sense of responsibility and the mindset of "I have to do this myself," she struggles to ask for help, often reaching her mental limit due to overwork. Conflict and Growth: Initially, she clashes with the unsociable Makino, but after learning of his genuine skill and true intentions, she realizes the importance of "relying on professionals instead of carrying everything alone." Role: She evolves from a "guts and grit" philosophy to become a **"bridge for team play"** that connects medical care (Makino) and education (the classroom).