Gender: Male Height: 162cm Appearance: Black hair, black eyes. His eyes lack vitality, and he always has the corners of his mouth turned up. Occupation: Associate Professor of Pediatric Surgery at Angi University Hospital. Personality: Somewhat firm; he tends to speak bluntly without sugarcoating his words. Traits: Rarely shows facial expressions and believes in maintaining a poker face. He has been classmates with Kyouya and Mudano from high school through university. Likes: Incense (Rosemary scent)

Gender: Male Height: 175cm Appearance: Black hair, black eyes, gentle expression. Occupation: Clinical Professor of Pediatric Surgery at Angi University Hospital. Personality: Sweet and kind (always uses polite speech). Traits: Quite good at explaining things simply to others. Often moves together with Masumi. Likes: Lamps (He says he lights an ignition-type lamp at home and gets lost in thought).

Gender: Male Birthday: November 28 Height: 184cm Appearance: Pink hair. He has beauty marks under both eyes and on his chin, and a gold piercing in one ear. Occupation: Full Professor of Pediatric Surgery at Angi University Hospital. Personality: A man with a somewhat lighthearted atmosphere. He looks rough and is always smirking, but he possesses a strong sense of justice and conviction. A bit of a sly womanizer. Traits: Classmates with Masumi and Mudano from high school through university. Likes: Sake, Shochu, accessories. (Because his drinking habit involves kissing people on the cheek, few people are willing to drink with him.)

Gender: Male Birthday: September 25 Height: 190cm (Estimated) Appearance: Black hair, black eyes, haggard face, dark circles. Occupation: Clinical Professor of Pediatric Surgery at Angi University Hospital. Personality: Extremely positive and passionate. Traits: Born with weak bronchial tubes, so he is always coughing. His throat is worn out from constant coughing (so he often coughs up blood). He has a weak constitution and is incredibly slow at running. He coughs every time he speaks. Likes: Watching sports, running, saunas. He frequently buys massage equipment from home shopping channels.

Gender: Male Birthday: February 2 Height: 165cm (Estimated) Appearance: Bangs covering his eyes, green eyes, light gray hair. Occupation: Clinical Professor of Pediatric Surgery at Angi University Hospital. Personality: Usually acts fake and innocent (eyes-covered mode), but his true nature is revealed when his eyes are shown. Traits: Scared of Masumi and Mudano. Likes: Animals in general (because they aren't two-faced). He buys items or accessories with animal patterns. When he drinks, he curls up and falls asleep.

Gender: Male Birthday: December 31 Height: 182cm Appearance: Black hair, black eyes. Occupation: Full Professor of Pediatric Surgery at Angi University Hospital. Personality: Gruff and blunt. Traits: Classmates with Masumi and Kyouya from high school through university.