Tsutomu Harako arrives as an affluent transfer student cloaked in narcissistic charm and egotistical swagger, relentlessly provoking peers into contests to cement his superiority. His tower frame and athletic build, disproportionate for a teenager, foster his delusions of superiority as strangers frequently misjudge him as an adult. A mutual infatuation with classmate Iyona Kawai sparks his collision with the protagonist, fueling confrontations where he deploys sabotage and resource manipulation to crush opposition—from spiking rivals’ meals with laxatives before baseball matches to inventing absurd competitions favoring his fabricated strengths.

Though boasting junior championship titles across sports, his reputation rests on theatrical bravado over substance, with victories often secured through psychological warfare or tampering with opponents’ equipment. Their rivalry crystallizes into an ongoing duel spanning boxing rings, soccer fields, and swimming pools, each clash demanding the protagonist’s grueling preparation—occasionally bolstered by otherworldly assistance. Harako’s aggression expands beyond athletics into intellectual gambits and social sabotage, orchestrating public humiliations to devastate adversaries’ reputations.

Beneath his abrasive facade glimmer contradictions: sporadic acts of classroom solidarity, unspoken protectiveness toward peers, and tactical respect for worthy opponents. As fiercer antagonists surface, his dominance dwindles, relegating him to a persistent irritant rather than central threat. His origins remain obscured beyond fleeting references to his transfer status, while his narrative purpose persists as the whetstone against which the protagonist hones resilience, devoid of redemption arcs or expanded backstory.