Arden, a genius mech repairman framed by a jealous manager and blacklisted, rebuilds his life in the Scrap Machinery District—fixing scrapped mechs that every major workshop rejected and shutting down every attack his rival throws at him. Inspired by pilot Cael, he builds an original mech from recycled parts, and together they conquer the interstellar arena, becoming legendary mech engineering masters recognized across the galaxy.