Shiro Tomoe, a racing prodigy obsessed with dethroning the century-old record of the enigmatic Loser King, faces ruin when a catastrophic crash severs his future. Surgeons salvage his life by replacing his heart with an engine ripped from his own car—a modification that brands him a mechanical component under racing regulations, exiling him from human competition.

Recruited post-recovery for the Planet Redevelopment Race, he battles outlawed pilots on Terulus, a colonial world ravaged by terraformer-spawned environmental cataclysms called "stampedes." Survival here demands speed: massive mobile cities host lethal races blending spectacle and necessity, their populations fleeing endless devastation.

The high-stakes contest offers Shiro his sole chance to reclaim glory and hunt Loser King’s legacy. A pragmatic alliance with a gifted engineer tests his resolve with tactical friction and unspoken tensions, though her expertise remains bound to the cockpit’s cold pragmatism.