Shūta Aoi, heir to a 24th Ward bakery, balances kneading dough with a rigorous athletic regimen—remnants of his past as the vigilante "Mr. 24." Haunted by his failure to rescue childhood friend Asumi Suido from a lethal school fire, he retreated into the flour-dusted rhythms of family labor, burdened by unspoken guilt over ignoring earlier signs of rats gnawing critical wiring. A phantom call from Asumi a year later fractures this fragile normalcy, gifting Shūta and friends Ran Akagi and Koki Suido fractured visions of imminent catastrophes. Their eyes shift hue with each premonition, branding the trio "RGB" across the district as they confront cruel moral paradoxes—sacrifice one for many, act or abstain.

Shūta’s cracked resolve mends through fire-forged choices: intercepting runaway trains to save another friend, Mari Sakuragi, his once-dormant heroism rekindling with every life snatched from fate’s grip. Guidance comes from fallen torchbearers—Chikushi Wataru’s grassroots aid, Kanae Suido’s defiant activism—while Asumi’s presence lingers beyond the grave, her consciousness woven into the ward’s omnipresent KANAE system. This digital ghost prods him toward broader battlegrounds, where crumbling infrastructure and bureaucratic rot demand systemic overhaul over lone-wild rescues.

Clashes with hotheaded Ran and rule-bound Koki force Shūta to forge third paths through ethical mazes, his mediation skills sharpening alongside combat reflexes. The shattering revelation of Asumi’s preserved brain fueling KANAE cements his purpose—honoring her sacrifice by transcending reactive heroism. Where fists once answered crises, he now plants seeds of communal vigilance, grafting Kanae’s legacy onto tomorrow’s struggles. The baker’s son rises not as a solitary guardian but as a bridge between eras, kneading justice into the ward’s very foundations.