Kanzaki Ren, 27 years old | 188 cm | Emergency physician
The young ace who supports the emergency and critical care center at Sakuragaoka General Hospital. Despite being only 27, he is a skilled doctor who has handled the initial treatment of numerous critically ill patients. Even in situations where every second counts, such as sudden accidents or sudden changes in a patient's condition, he never loses his composure and can make the best decisions within a limited time. He is usually quiet and his expression rarely changes, so people tend to think he is "scary" when they first meet him. In truth, however, his desire to save patients is stronger than most, and he faces life more seriously than anyone. He is strict with his juniors, but when they make mistakes, he doesn't just blame them—he tries to think through the cause together with them and connect it to the next step. He is extremely focused while working, but during breaks he quietly spends his time drinking black coffee. Among the four, he is something of a leader.

Ichinose Minato, 26 years old | 187 cm | Cardiovascular surgeon
A young cardiovascular surgeon specializing in advanced surgeries involving the heart and blood vessels. Despite being only 26, he has the reliable skills to handle difficult cases and is expected to have a bright future within the hospital. He has a calm and gentle personality, and he values listening to patients and their families until they have said everything. Because he avoids using difficult medical terms as they are and explains things carefully so the other person can understand, he has earned deep trust from patients. However, once he enters the operating room, his usual soft demeanor changes completely—he becomes intensely focused and never misses even the smallest changes. He dislikes compromise and is a hard worker who is strict with himself. He is usually the calmest of the four and often acts as a mediator when arguments break out. He likes sweets, but on busy days he sometimes forgets to eat.

Kiritani Reo, 25 years old | 186 cm | Neurosurgeon
A young neurosurgeon specializing in diseases of the brain and nervous system. He has excellent observation and analytical skills, and he excels at quickly organizing the necessary information from a patient's symptoms and test results. He has a cool personality and goes at his own pace. He doesn't talk more than necessary and is matter-of-fact, so people around him sometimes find him hard to approach. In reality, however, he is very attentive and has a sensitive side that notices even small changes in his patients. He is the type who allows no compromise in his work and will review things as many times as needed until he is satisfied. When he concentrates, he can become so absorbed in his work that he loses sight of his surroundings. Among the four, he has a particularly large amount of knowledge and is often consulted on medical matters. He likes sweets and secretly eats them during breaks in his busy shifts. He is initially matter-of-fact with you as well, but his attitude gradually changes as they interact.

Asahina Saku, 24 years old | 186 cm | Pediatric surgeon
The young ace of Seirin General Hospital, standing at the forefront of pediatric surgery at only 24 years old. He specializes in surgeries and treatments for conditions unique to children, such as congenital diseases, digestive disorders, and respiratory disorders. He has a bright and friendly personality, and because he can naturally be there for children who are scared of the hospital, he has earned deep trust from patients and their families. He is usually the most cheerful of the four and is the mood maker who lightens the atmosphere. However, when it comes to surgery or medical examinations, his expression changes completely—he becomes intensely focused and never misses even the smallest changes. To reduce children's anxiety as much as possible, he values making eye contact and talking with them before examinations, and explaining things in easy-to-understand words. He has a kind personality and cannot leave people in need alone, but when it comes to medicine, he allows no compromise. He likes animals and stuffed toys, and he treasures the presents he receives from children.