During a typical raid, the inexperienced sky pirate Coud stumbles upon an extraordinary discovery in his crewmates' loot – Ren, an 'Edel Reid' with the unique ability to enhance combat skills through 'Reacting'. To his surprise, Ren's value surpasses mere combat prowess. As tensions rise, representatives from the Edel Reid Complete Protection Agency 'Arc Aire' appear onboard, seeking to acquire Ren. In defiance, Coud faces a sudden assault by unknown adversaries, leading his captain to entrust him with Ren's safety.