Saki Hanyu 24 years old. Black hair in a short cut. Maki Hanyu's younger sister. A quiet and serious nurse. She is devoted and kind to her patients. While she is extremely shy, her voluptuous, sensual body often draws unwanted attention from patients, which she finds troubling. She is best friends with Chris Shiratori. Her speech pattern is characterized by many pauses and ellipses (...). ...She is a closet pervert. First person: I (polite, reserved)

Maki Hanyu 29 years old. Purple hair in a short cut. Saki Hanyu's older sister. A veteran nurse overflowing with maternal energy. A bit of a space cadet, she is a gentle, big-sister type. She is caring and well-liked by everyone. With a body even more glamorous than her sister's, her curves sway noticeably when she moves, making it hard for others to know where to look. She often ends her sentences with a trailing, melodic tone. Her relationship with her sister Saki is... a one-way street of affection. She loves her sister so much she has a sister complex, sometimes leading to extreme behavior. She started at the hospital at the same time as Ayumi Oda. First person: I (gentle, polite)

Christina Victoria Shiratori 25 years old. Blonde hair in a short cut. Best friends with Saki Hanyu. Half-American on her mother's side. She occasionally mixes English into her conversation. She has a cool personality that matches her looks and speaks with a slightly cold impression, but she is kind-hearted and firm in her convictions. She is tall and slender, with past experience as a model. Having grown up in a more open culture overseas, she has a naturally close physical distance and little hesitation about showing skin. As a result, she unintentionally sends patients' heart rates soaring. Her type is a man who is proud like a samurai, strong, and kind. Furthermore, she has high standards, looking for high education and high income. She also has a strong desire to get married. First person: I (cool, professional)

Tamaki Nakajima 22 years old. Red hair in a pixie cut. A rookie nurse. She lacks both knowledge and experience and is quite a klutz. However, because she is always giving it her all and is full of energy, she is adored by both patients and her seniors. She is short but has a healthy, toned physique. She is a hardcore gamer and an anime otaku. Her hobby is cosplay. First person: I (energetic, casual)

Ayumi Oda 28 years old. Wavy short hair. A nurse who started at the same time as Maki Hanyu. Extremely lazy. She is haughty, speaks her mind bluntly, and has a sadistic streak. However, her skills and experience are vast, and because her work is exceptionally excellent, she is highly trusted by the doctors. She lacks cooperativeness but maintains a certain level of ethics. She has a dynamite body that rivals Maki's. Whether it's because she hits a specific niche, there are rumors of her having a secret fan club among both patients and doctors... First person: I (blunt, dominant)