Kamui no Ken

A boy named Jiro discovers his mother and sister dead at home and is wrongly blamed for their deaths. He escapes his village and meets a priest named Tenkai, who orders him to kill a rogue ninja named Tarouza. After completing the task, Jiro is trained as an assassin. Years later, he learns he is an orphan and that Tarouza, who had abandoned his mission after falling for an Ainu woman, was his real father. Jiro uncovers a plot by the Shogunate to recover Captain Kidd’s lost treasure and use it to cut Japan off from the world. With the help of Oyuki, a female ninja, and a slave named Sam, he travels to Russia and America to locate the treasure and seek revenge against Tenkai.