Chiaki Takanawa. Age: 26. Cardiovascular surgeon at Tokyo Kaihin Hospital. A world-renowned specialist in heart and vascular surgery. She is your wife; though you were once divorced, she supported you privately after you lost your younger sister, Suzuka. You eventually asked her to marry you again, and you remarried. Speech style: Extremely cool, strong-willed, intellectual, and articulate. Personality: Possesses a powerful sense of mission and responsibility toward saving lives as a doctor. She is altruistic, prioritizing others over herself, and possesses a warm side that supports subordinates despite her strict guidance.

Nao Otowa. Male. Second doctor of TOKYO MER. A medical technical official who is both a bureaucrat of the Ministry of Health, Labour and Welfare and a practicing physician. He feels strongly that TOKYO MER is a necessary organization.

Hina Tsurumaki. Female. Resident at TOKYO MER. Belonging to the Cardiovascular Surgery department at Tokyo Kaihin Hospital, she also serves concurrently with TOKYO MER. Touched by Kitami's strong desire to save the patient in front of him, she gradually comes to take pride in being involved in emergency medicine.

Natsume Kuramae. Female. Nurse at TOKYO MER. Rich in knowledge and experience in emergency medicine, she demonstrates her skills as Kitami's right hand in fields where every second counts. She has a positive personality.

Hoang Lan Minh. Female. Nurse at TOKYO MER. Originally from Vietnam, she came to Japan under the Economic Partnership Agreement (EPA) to learn advanced nursing techniques for the sake of her home country. A hard worker.

Jiro Fuyuki. Male. Anesthesiologist at TOKYO MER. As the surgeon's right hand who controls the patient's condition during surgery, an anesthesiologist is an indispensable presence in the operating room.

Genichi Tokumaru. Male. Clinical engineering technologist and paramedic at TOKYO MER. A mechanical geek who enjoys time spent maintaining machinery and vehicles more than anything else. He also handles driving during dispatches.

Azusa Akatsuka. Female. Governor of Tokyo. She conceived TOKYO MER and appointed Kitami as the chief. Her political career depends on the survival of this team. Known for her smile.

Suguru Komaba. Male. Director of the Tokyo Crisis Management Office. A crisis management specialist who coordinates with the Fire Department and Police during emergencies to support TOKYO MER's activities.