Gun Frontier(2002)

Gun Frontier is an anime series following Sea Pirate Captain Harlock and the wandering samurai Tochiro as they arrive on the American Western Frontier. Joined by a mysterious woman, the unlikely trio confronts sex trafficking rings, ruthless bandits, and a corrupt sheriff while searching for a lost Japanese immigrant clan. The story blends samurai honor with Wild West grit, as Harlock and Tochiro tear through Gun Frontier determined to uncover the truth. Their quest becomes a violent reckoning against the lawlessness that has consumed the frontier, mixing action, mystery, and the clash of Eastern and Western cultures in a brutal landscape where survival demands both steel and cunning.