Kusue Hakozaki bears the weight of a chronic illness that saps her stamina, restricting physical activities and fueling years of social isolation and schoolyard bullying. Educators dismissed medical constraints, failing her in physical education and deepening her sense of inadequacy. Driven by academic ambition, she dedicates herself to medical studies, determined to conquer her health struggles and aid others facing similar battles.

Thrust into a game-like realm as a Warrior, her physical frailty hampers even basic swordplay. Guided by NPC Kahvel’s training, she gains technical precision yet recoils from harming foes, her caution pierced by fleeting acts of courage against looming dangers.

Her dynamic with protagonist Yūsuke Yotsuya casts her as a moral compass, questioning his pragmatic choices while recognizing his guarded loyalty. Within the group, she evolves into a nurturing presence, prioritizing ethical dilemmas during missions. Personal growth emerges as she grapples with the psychological scars of violence, balancing her aversion to conflict with survival’s harsh demands.

Repeated brushes with mortal peril gradually forge resilience, her self-image reshaped through adversity. Flashbacks and conversations echo past traumas—relentless bullying, institutional indifference—that fuel her empathy. Later arcs suggest budding strategic influence within the team, though details beyond her initial skill progression remain sparse.