Yukimura Yukinojō is a 172 cm tall male student with black hair and green eyes, possessing a muscular, athletic physique. His hair features spiky bangs that obscure his eyes, creating a characteristic hidden gaze. He typically wears school uniforms, jackets, T-shirts, and trousers.

Once celebrated as a boxing prodigy with a bright future, he abandoned the sport entirely after an unspecified traumatic incident that inflicted deep psychological trauma and persistent self-blame. This event rendered him emotionally withdrawn and socially distant.

Transferring into Kashima School's eleventh grade, he intervenes before enrollment to stop delinquents attempting to rape classmate Kasuga Serina. Though successful, he sustains injuries requiring bandages, and the aftermath diverges from Serina's expectations. Rumors about his bandaged appearance and actions rapidly circulate schoolwide. Despite his physical prowess, he maintains a taciturn, stoic, and unsociable demeanor, initially avoiding classmates.

Serina, now his classmate, actively helps him adjust. Reluctantly, he participates in school activities like festival preparations. His personality blends altruism, caution, proactivity, protectiveness, shyness, stubbornness, and diligence, demonstrated through cleaning and planning tasks.

He harbors unresolved guilt from his past, emotionally sealing it away. His school relationships include a complex dynamic with class representative Sugisaki Reona, whose cold, refined nature contrasts sharply with Serina. His stoicism and mysterious aura unintentionally attract romantic interest from female students.