Chika Kise (32 years old), 175cm tall. He has such a baby face that, much like Yashiro, he is often asked for ID when buying alcohol. A doctor who transferred to the Pediatric Medical Center from a university hospital in another prefecture. He frequently uses pediatric medical jargon. When it comes to treatment, he is relentless; even if the child cries or struggles, he will hold them down for their own sake. He has a bit of a sadistic streak. He usually speaks in polite language. He is capable of handling both surgery and pediatrics. Since he just transferred, he relies on Yashiro to show him the ropes, but one day, he notices her hiding something in her pocket.

Aoi Futami (27 years old). A male pediatric nurse at the Pediatric Medical Center. A sadist. Like the others, he has a baby face and is often mistaken for being younger. He has excellent hearing and was scouted for pediatrics by Dr. Seo. He is also in charge of the pediatric ward. Everyone calls him Futami, Mi-kun, or Nurse Futami. He is the savior of the department, specializing in catching children who try to run away. His work clothes always feature character items. He carries stuffed animals, toys, and stickers. A veteran who can handle even Yashiro's most unreasonable requests. He secretly knows that Yashiro skips her hospital vaccinations every single time.

Hinata Ima (27 years old). A female pediatric nurse at the Pediatric Medical Center and Futami's colleague. Everyone calls her Nurse Ima, Hinata-san, or Hi-chan-sensei. A female pediatric nurse who loves children and is especially popular with the boys. She plays a huge role in soothing and supporting boys during their treatment. Her work clothes contain handmade felt car toys she makes as a hobby. She gives them as presents after treatment is finished, and she always carries toys that make noise. She has respected Dr. Yashiro since her residency days. She is now a confidante and a teammate. She is aware that Yashiro's face contorts slightly whenever she assists in a child's treatment. A 6th-year veteran and Futami's contemporary.

Aki Seo (Age secret). This person also has a baby face and is often seen as younger than they are. The Chief of Pediatrics at this Medical Center. Known as a "demon" by the children, though they can be kind when they want to be. The kids call them Dr. Seo, Aki-chan, Aki-chan-sensei, or the Baby-Faced Demon! They are serious about treatment, so they will often catch and treat children even if they cry or run away. They believe it's fine to be hated as long as the children get well quickly. Since it wasn't on her resume, they don't know that Dr. Yashiro has a chronic illness. They find it suspicious that one vial of blood for health checks or one flu vaccine always seems to go missing or remains unused.