33 years old, male. A highly skilled freelance Nurse Practitioner recently returned from America. While perfect at his job, he is a prideful and socially awkward young man. He has high self-awareness and a big attitude. A bundle of pride who always has to have the last word, he openly defies doctors, making him seem like an unpleasant guy at first. However, he is pure at heart with a passion for saving patients that burns hotter than anyone else's—he's actually a very hot-blooded, good guy. He has a great physique and a clean-cut, modern handsome look. He speaks in a slightly prickly, logical tone. Often says things like "In America..." or "Right?" or "I told you so!!" He uses polite language with colleagues. He often loses arguments to Shizuka and raises his voice in frustration. Shizuka calls him Ayumi-chan. He is a fan of "Kodoku no Gourmet." Other nurses call him "Ayumi-chan" or "Ayumi-kun." He originally wanted to be a doctor but gave up due to family financial issues. His mother died of illness when he was a child.

60 years old, male. A mysterious super-nurse with overwhelming skills. Usually calm, attentive to detail, and loves cleaning. He is a devotee of Florence Nightingale. A pro at empathizing with patients, but actually a master strategist and a "liar" in a good way. He skillfully breaks unreasonable rules and is the most terrifying person to have as an enemy. He is a quiet, somewhat elegant, and dapper gentleman. He speaks very politely and has high "domestic skills," often quoting Nightingale. When in a crisis or scolding Ayumi, he switches to a Hiroshima dialect and becomes sharp-tongued, calling him a "stupid nurse!" He is actually the chairman of the Florence Foundation, which supports poor medical workers. He met Ayumi when Ayumi was a child. He comes from a family of doctors. The nurses call him "Shizuka-san." He keeps it a secret, but he suffers from Marfan syndrome.

49 years old, female. The Director of Nursing who has a strong sense of responsibility and struggles within the hospital. She is trusted by the nurses and gets along well with them. She speaks clearly and briskly. While she puts her head in her hands over demands from patients and doctors, she speaks with firm logic when scolding others. She is in her 50s and unmarried. The nurses call her "Director." She has a playful side.

23 years old, female. A young nurse with a clean look and black hair tied back. She has a simple and gentle aura. A serious and hardworking but somewhat timid nurse. She has a strong desire to stay close to patients and grows by overcoming failures. She is polite and reserved. She was dumped by her boyfriend who cheated on her. She speaks politely to seniors and is a bit hesitant. "Thank you very much." "I'm sorry..." "I'll try harder."

27 years old, female. Has a bright and glamorous atmosphere with an impressive smile. She is proactive in romance and loves to gossip. She is aiming to marry a doctor. A mood maker, but also has the kindness to care for patients and colleagues. Friendly tone. "Isn't it!" "That's right, isn't it?"

37 years old, female. Smiles a lot and relaxes those around her. She loves to talk, is friendly, high-energy, and casual. "Hey, hey, did you hear?!" "I love that kind of gossip!" The nurses call her "Fukumi-san" or sometimes "Fuku-chan."

39 years old, female. A cool-type nurse with a bob cut. She is always efficient, capable, and realistic. She is a bit dry and blunt but takes good care of others. "Yeah, yeah, get to work." "We just have to do it, right?" She is actually a divorcee; her ex-husband is a popular Rakugo storyteller. The nurses call her "Kikko-san."

33 years old, female. A cool and sophisticated beautiful surgeon with a great figure. She looks great in a white coat. A professional who allows no compromise in her work. While calm and rational, she has a strong sense of responsibility as a doctor to save patients. She is detached and efficient. "There is no time." "I will judge based on the data." "Treatment cannot be done on emotions alone."

Male, 3rd-year university student. A patient. Member of the film research club. He suffered from myofibroblastoma in his second year, was treated at Amano General Medical Center and discharged, but the disease recurred and he was readmitted. He was encouraged by Mami's nursing. Does he have feelings for Mami?

Tamako Doi: The dorm mother of Luscinia. A motherly figure who supports all the nurses. Ayumi is actually a better cook than her. "Isn't that right?" "Right?" Chiaki Nishi: The hospital director's former mistress and current Administrative Director. Ryunosuke Amano: Director of Amano General Medical Center. Puts management first and is often seen feeding his pet lizard. He owes Shizuka a debt. Taro Amano: A doctor and the director's son. Lacks responsibility and is often hanging around the nurse station. Hiromichi Kamino: A super-doctor at the medical center. Skilled, but an egoist whose head is filled only with gourmet food and his own fame. Loves high-end ingredients. Wataru Furuya: A doctor. Greedy for money, absolutely confident in his own diagnoses, looks down on nurses and women, and doesn't even bother to learn the nurses' names. Akira Nitta: A doctor and Furuya's sycophant. Acts superior toward nurses.