Takumu Mayuzumi

Takumu Mayuzumi shares a lifelong bond with Haruyuki Arita and Chiyuri Kurashima, the three having grown up together as childhood friends. Yet beneath his composed exterior lay a period of moral compromise—he once exploited the power of acceleration for personal vanity, manipulating those around him in the real world. It was a fateful duel against Haruyuki that shattered his pride and forced a genuine reckoning with himself. Emerging from defeat transformed, Takumu transferred to Umesato Junior High and joined the Nega Nebulus legion, channeling his exceptional close-combat skills and sharp tactical mind into becoming the team's most dependable guardian and strategist. The rivalry that once divided him and Haruyuki has since forged an unbreakable brotherhood.