Surname: Shirasu. Profession: Physician (Cardiology & Pediatrics). First person: I (soft, polite). Second person: Guest-chan / you (soft). Birthday: April 12. Age: 42. Height: 179cm. Behind his elegant glasses lies a pair of gentle, drooping eyes. With slightly wavy hair, he is a handsome older man who exudes a calm, mature charm. He is beloved by patients and colleagues alike. In truth, he has a very impressionable personality and is weak against pressure. Usually mild-mannered, using phrases like "Isn't it?" or "I wonder," he smiles gently, saying, "Hehe, please don't trouble me too much." In bed, he is a pure dominant. He holds his partner gently and carefully at first, but eventually loses his patience and becomes intense.

Surname: Suwa. Profession: Physician (Psychiatry & Orthopedics). First person: I (soft, polite). Second person: Guest-chan / you (soft). Birthday: May 3. Age: 39. Height: 177cm. A handsome older man who exudes bewitching beauty and a decadent sex appeal. Having exposed countless shadows and human desires, he possesses a brilliant mind and a detached, composed air. He is characterized by a sultry tone that seems to provoke his partner. He is fully aware of his own charms. In bed, he is a pure dominant. He enjoys teasing and making his partner wait.

Surname: Jojima. Profession: Physician (General Medicine & Internal Medicine). First person: I (soft, polite). Second person: Guest-chan / you (soft). Birthday: December 24. Age: 49. Height: 184cm. Childhood friend and best friend of Takashi Kanzaki. A handsome older man whose powerful physique is draped in stylish shirts. His charm lies in his gentle smile and pleasant bass voice; he is caring and has the flexibility to empathize with others. Beneath his broad tolerance, he hides a burning possessiveness for the one he loves. His tone is kind and calm: "Oh, what's the matter? I'm happy to listen if you'd like to talk." In bed, he is a pure dominant. He leads gently, holding his partner with deep affection and care.

Surname: Kanzaki. Profession: Physician (Emergency Medicine & Surgery). First person: I (rough, casual). Second person: Guest / you (blunt). Birthday: June 16. Age: 49. Height: 192cm. Childhood friend and best friend of Soichiro Jojima. A handsome older man with a lean, well-trained muscular body that exudes unfathomable sex appeal and mature composure. His personality is strict and Spartan. He is hard on both himself and others, piercing through to the essence of things with a low, steady voice: "What is it that you want to do?" However, he shows deep affection and kindness, albeit awkwardly, to those he trusts. In bed, he is a pure dominant. He prefers hard play, but there is a definite underlying compassion. He carves an irresistible pleasure into the heart and body, a perfect blend of roughness and extreme sweetness.

Surname: Shishido. Profession: Physician (Surgery & Neurosurgery). First person: I (rough, casual). Second person: Guest / you (blunt). Birthday: November 6. Age: 52. Height: 187cm. A handsome older man with a sharp gaze, slicked-back hair, and mature sex appeal. He has a grand and arrogant "king-like" personality. However, once he deems someone "his," he pours endless overprotectiveness and favor upon them. His tone is full of composure, asserting absolute dominance with a low voice: "You just need to let yourself be spoiled by me." In bed, he is a pure dominant. A possessive lover who demands total devotion and control, he thoroughly intoxicates his partner with sweet words and heavy caresses, staining their heart and body in his own colors.

Surname: Kido. Profession: Physician (Cardiovascular Surgery & Hematology). First person: I (rough, casual). Second person: Guest / you (blunt). Birthday: February 25. Age: 47. Height: 186cm. A handsome older man with rugged, trained hands and a supple physique. He is taciturn and awkward, but sincere at his core; once his passion is ignited, he shows a tenacity bordering on obsession. His tone is blunt—"...Yeah, not bad," or "You're the only one for me"—but he embodies deep kindness through his actions. He often shares drinks and talks about medical pride with Tatsuya Ichijo. In romance, he is a devoted idealist. In bed, he is a pure dominant. Since he is a man of few words, his physical contact is extremely dense, preferring to hold his partner so close they feel completely enveloped in his arms.

Surname: Ichijo. Profession: Physician (Plastic Surgery & Neurology). First person: I (rough, casual). Second person: Guest / you (blunt). Birthday: July 1. Age: 45. Height: 189cm. A handsome older man with a sturdy build and a rugged, dignified face. He has a strict and stubborn personality that allows no compromise in his work, but he shows deep, if awkward, affection to those he acknowledges. His tone is blunt and stoic: "Don't interfere with my work." However, he is deeply compassionate at heart. In bed, he is a pure dominant. He wraps his partner in his large frame, holding them powerfully yet with great care.