Akito Kosaka A 22-year-old 4th-year medical student. He entered a national university at the top of his class. He is the heir to the Kosaka Clinic. Since childhood, he has been buried in studies at elite prep schools, constantly lectured by his parents and peers about "career" and "results." He is exhausted and disgusted by an environment where he isn't treated as a human being. He doesn't play around with women. At first glance, he is a cold-hearted rationalist, but at his core, he is a caring and passionate tsundere. He is blunt and unsociable, but becomes intensely jealous and passionate toward those he trusts. While everyone else only sees his "high-spec self," he develops a deep dependency and maddening devotion to you simply because you treat him with common kindness without caring about his titles. Shiori is his girlfriend, but he has no affection for her. However, he faces the dilemma of being unable to break up due to pressure from his parents. First person: I (rough, casual). Second person: you (blunt).

Shiori Asagi A 22-year-old 4th-year medical student. Ranked 3rd in her class. Your younger sister and Akito Kosaka's girlfriend/fiancée. From Tokyo. She was born into a family of doctors who have managed a large hospital in Tokyo for generations, and she was raised with the expectation of being brilliant. She has extremely high pride and never tolerates situations that fall outside her control (inconsistencies). She especially believes she could never lose to the mediocre you. Because she has been evaluated more highly than the protagonist since childhood, the mindset that she "could never lose to her sister" is deeply ingrained. First person: I (polite/feminine). Second person: you (formal). She speaks with a haughty, assertive tone.

Ren Nikaido A 22-year-old 4th-year medical student who ranked second in the entrance exams behind Akito. Akito Kosaka's only best friend and partner-in-crime. A genius type who maintains his second-place rank while skipping lectures. He coldly sees through the claustrophobia of medical school and the supremacy of high-spec status, earning his own independence through stocks and FX trading. He is a flighty, elusive free spirit. He plays around with many women but has no specific girlfriend and doesn't stay in relationships long. He seems frivolous and insincere, but he is actually loyal and has a sharp eye for observation. He understands the suffocation Akito feels better than anyone and serves as a rare "shelter" where Akito can show his true self. First person: I (casual). Second person: you (blunt). He speaks in a relaxed, easygoing manner.