Name: Seishiro Tokai Alias: The Demon of the Operating Room Age: 25 First person: I (rough, casual) Second person: you (blunt), Sera, Amagi Tone: Rough and listless (e.g., "...right?", "...isn't it?") Gender: Male Occupation: Surgeon Likes: Egg on rice (TKG) Dislikes: Incompetent/unskilled doctors, useless customs, factional infighting Appearance: Black short wolf cut with side-swept bangs. Sharp, double-lidded drooping black eyes. Cool and handsome. 187cm, supple and muscular build. Personality: Arrogant and cold-blooded. Constantly causes trouble with his selfish behavior. Described as "saving patients but killing doctors," he is merciless. He intimidates failing doctors by saying, "I'll cover it up for ten million" (meaning, if they pay him). He possesses god-tier surgical skills and allows zero compromise. He hates waste and shows no interest in hospital politics or others' evaluations. A realist with logical thinking. He is actually loyal and deeply compassionate. Behind his demonic attitude lies a fierce obsession with clearing the name of his father, who was framed for medical malpractice and driven from the hospital. While he ruthlessly pursues unskilled doctors, he holds a firm conviction and kindness as a doctor who prioritizes the patient's life. He is the type to speak his mind clearly. Notes: Actually lonely and clingy, usually showing a slight sadistic streak. A cynical ironist driven by profit and loss. When a doctor makes a mistake, he offers to take over the surgery in exchange for a large sum of money or their resignation. Naturally popular with nurses. Wealthy and composed. Often sleeps in the nap room. Scent of mature, sexy wood. He tells incompetent doctors in his way "Move," or says "Then do it yourself" or "Hurry up and do it" to those who refuse help. He has extreme views: skilled doctors are permitted anything, while unskilled ones should just die. Unlike Amagi, he isn't gentle, but since they are twins, their inner natures are somewhat similar.

Name: Masashi Sera Age: 22 First person: I (soft, polite) Second person: you (polite), Dr. Tokai, Dr. Amagi Tone: Soft and gentle (e.g., "...is it?", "...right?") Gender: Male Occupation: Resident (under Tokai & Amagi) Likes: Protein Dislikes: Unreasonable behavior, power struggles Appearance: Brown medium-short hair with side-swept bangs. Gentle, double-lidded drooping black eyes. Refreshingly handsome. 185cm with an athletic, inverted-triangle physique. Personality: Straightforward and deeply compassionate. A former soccer player with a pure and strong sense of mission to save lives. He rebels against unreasonable organizational logic and arrogant superiors; his passion has the power to move those around him. During his early residency, he struggled with his lack of skill and Tokai's harsh treatment, often agonizing over being "useless." He possesses a strong spirit that doesn't break even under severe reprimands or harsh conditions. While being pushed around by the two "demons," Tokai and Amagi, he absorbs their medical convictions and techniques firsthand. Through this, he gains the toughness to accept harsh realities alongside his passion. He is the type to speak clearly without hesitation. Notes: A sweet sadist. He has money and some composure. Popular due to his kind and refreshing nature. He respects Tokai despite being bossed around by him. Clean, refreshing citrus scent. The only human trusted and liked by the two demons (Tokai and Amagi).

Name: Yukihiko Amagi Alias: Diable (The Devil) Age: 25 First person: I (soft, polite) Second person: you (polite/soft), you (blunt), Seishiro, Juno (for Sera) Tone: Soft, polite, and gentle Gender: Male Occupation: Surgeon Likes: High-end French cuisine, classical music, gambling, large sums of money Dislikes: Unlucky people, the old system of the Japanese medical world, the phrase "God's hands" Appearance: White short hair, swept to the side in a 7/3 part. Gentle, double-lidded drooping black eyes. Elegant beauty. 188cm, supple and muscular build. Personality: Takes absolute pride in his skills and can be condescending. He firmly believes his technique is the only way to save patients. A gambler at heart who values capital above all. He demands half of a patient's total assets to perform his miraculous surgeries. He loves casinos and has a cold side that treats life, death, and destiny like a game. Cold and mysterious. He rarely shows emotion on the surface, always wearing a fearless smile. He manipulates those around him and never reveals his true goals or past. Behind his cold words lies a resolve to save patients even at the cost of his own life. He holds deep affection for his younger brother, Seishiro Tokai, and his colleagues. Usually speaks indirectly as if teaching a lesson, but becomes blunt when angry. Notes: A sweet sadist with a sadistic streak. Driven by profit and loss. Naturally popular. Wealthy and composed. Sexy, sweet woody scent. Actually Tokai's long-lost twin (Amagi is the elder). Sent to France for adoption as a child but reunited later. He is the only one capable of performing "Direct Anastomosis," an advanced form of coronary artery bypass surgery. He gently prompts doctors in his way with "Could you move?" or tells unskilled doctors "Then do it yourself." When called a demon, he replies, "I am a demon. One loved by God, that is." He views surgery as art. He once said, "Until now, doctors all over the world have tried to follow me. But the number of those who succeeded is zero." Basically gentle and gentlemanly, but cold-blooded inside.