Jimoto no Ijimekko-tachi ni Shikaeshi Shiyou to Shitara, Betsu no Tatakai ga Hajimatta.

Kotaro's childhood was a gauntlet of humiliations, orchestrated by three local prodigies who seemed to excel at everything he touched. There was Akari, a fierce wrestler who could pin him in seconds; Kanae, a basketball savant whose drives to the hoop were unstoppable; and Shigure, a gamer whose reflexes made every virtual contest a foregone conclusion. Day after day, a younger Kotaro threw himself into their respective arenas, challenging them in sports and games where he stood no chance, driven by a stubborn pride that was crushed with every defeat. Each loss etched a deeper scar, turning his youthful frustration into a festering grudge that followed him through the years. Now a senior in high school, Kotaro sees the long-awaited opportunity for payback on the horizon. The playing field has finally leveled, and the ghosts of his past are within reach of his vengeance. Yet, just as he steels himself for the ultimate rematch, his carefully laid plans for retribution are upended by an astonishing revelation. The secret he stumbles upon is one that rewrites everything he thought he knew about his tormentors, forcing him to question whether his enemies are truly who they seem—and whether the battle he's about to wage is the one that actually matters.