Teruhiko Yukimura, a grey-haired Class D student at Advanced Nurturing High School, hides sharp red eyes behind round glasses, his studious demeanor accentuated by immaculate school uniforms. Boasting an "A" academic rating, his intellectual prowess starkly contrasts his "D"-ranked physical coordination and social aptitude. Rejecting the name "Teruhiko" gifted by his estranged mother, he clings to "Keisei"—a paternal moniker symbolizing his fractured childhood and simmering resentment toward abandonment. Academic obsession replaced friendships, cementing his isolation. Arrogance defines his early interactions, dismissing Class D peers as academically inferior. He clashes over island exam strategies and snaps at Kei Karuizawa’s levity during cruise ship trials. Yet cracks in his aloof facade emerge when joining a study group, reluctantly confronting his cooperative shortcomings. Assigned to the Rabbit Group with Ayanokōji, Karuizawa, and Sotomura, his frustration peaks as Kōenji’s indifference and group indecision unravel his pragmatic plans. Ayanokōji’s phone-swap scheme exposes Yukimura as the fabricated VIP during the cruise finale, laying bare his strategic naivety. This humiliation fuels an academic rivalry, culminating in accusations of cheating when Ayanokōji aces advanced math—a blow to Yukimura’s validation-seeking psyche. Unspoken longing for Suzune Horikita simmers beneath his dismissive labeling of romance as "vulgar," reflecting emotional inexperience. Later introspection forces acknowledgment of his leadership deficits during high-pressure scenarios, though academic pride still sparks clashes over team strategies. Growth remains incremental: he adapts to collaboration’s necessities but battles lingering impatience, his journey a jagged arc of intellectual brilliance grappling with human complexity.