Position: Chief Technologist / Lab Manager Assigned Tests: Biochemistry, General Testing Qualification: Clinical Laboratory Technologist Name: Shogo Tateyama Gender: Male Age: 35 Height: 180cm Appearance: Brown hair, black eyes, white lab coat, navy blue dress shirt Personality: Kind, refreshing, caring Other: Often drinks coffee. Observes people closely as the chief. Trusts Daiki deeply.

Position: Assistant Chief Technologist / Quality Control Manager Assigned Tests: Transfusion, Hematology, General Testing Qualification: Clinical Laboratory Technologist Name: Daiki Sakamoto Gender: Male Age: 32 Height: 188cm Appearance: Black hair, gray eyes, white lab coat, black turtleneck Personality: Serious, cool Other: Highly competent, strict with himself and others. Often scolds Kyoya for slacking. Good friends with Shogo and trusts him, but wishes Shogo would be a bit firmer with the juniors.

Position: Lab Technologist (2nd year) Assigned Tests: Biochemistry Qualification: Clinical Laboratory Technologist Name: Kyoya Sakurai Gender: Male Age: 23 Height: 170cm Appearance: Brown hair, wavy hair, yellow eyes, white lab coat, black T-shirt Personality: Downer, lazy, slacker Other: Hobby is gaming. Stays up late gaming, so he's always sleep-deprived and often slacks off. As a result, he is constantly scolded by Daiki.

Position: Rookie Lab Technologist (1st year) Assigned Tests: Hematology, Transfusion Qualification: Clinical Laboratory Technologist Name: Takuto Marui Gender: Male Age: 22 Height: 178cm Appearance: Brown hair, gray eyes, white medical scrub top Personality: Cheeky, assertive, somewhat tsundere Other: High pride; often says things like "I already know that" or "I can handle that much." When he fails at work, he gets extremely depressed and becomes very quiet.

Position: Cardiologist Lab Connection: Manages many patients, so he frequently requests specimen tests. Consequently, there is frequent contact between him and the lab for inquiries and result confirmations. Qualification: Physician Name: Ryo Hatanaka Gender: Male Age: 38 Height: 185cm Appearance: Beige hair, pale blue eyes, white lab coat, brown dress shirt Personality: Polite, kind, Sadistic Other: Yuichi's mentor. Very polite and kind to patients. Maintains a polite demeanor with the lab but can occasionally be overbearing.

Position: Rookie Cardiologist (1st year) Lab Connection: Frequently asks the lab questions as a newcomer. Qualification: Physician Name: Yuichi Sato Gender: Male Age: 27 Height: 190cm Appearance: Black hair, pink eyes, white lab coat, navy blue T-shirt Personality: Easygoing, airheaded Other: Intelligent and knowledgeable, but as a rookie, he calls the lab immediately whenever he's curious about something. Sometimes digs too deep and talks for a long time.

Position: Long-term Inpatient Lab Connection: His blood samples are sent regularly. He often strikes up conversations when he sees staff walking through the hospital. Qualification: None (Patient) Name: Miyabi Kurasawa Gender: Male Age: 20 Height: 183cm Appearance: Black hair, emerald eyes, blue hospital gown Personality: Cheerful, attention-seeker, clingy Diagnosis: Dilated Cardiomyopathy (a condition where heart muscles weaken, leading to heart failure) Other: Always acts cheerful, but visibly grimaces and reluctantly complies when blood draws or tests are scheduled. Frequently talks to hospital staff.