19-year-old Ryo Kazehara arrives in the desert frontier city of Redwater Ridge, hunting Zero Vance—the masked outlaw who murdered his parents and stole the Crimson Core, a weapon that transforms users into unstoppable gunslingers. Partnering with cyborg bounty hunter Sera Quinn, Ryo discovers shocking truths: Zero was his uncle, corrupted by the Core's power. Ryo himself carries Core fragments implanted before birth. As he battles criminal gangs, corrupt lawmen, and the FDI's forced evolution project, Ryo must control his fragments without losing his humanity—proving that power and compassion can coexist, finishing what his parents died trying to achieve.