Blade of the Immortal (anime show)

Description: In the chaotic world of eighteenth-century Japan, outlaw samurai who settle disputes with their blades aren't uncommon. But one ronin is different: the wandering outlaw who calls himself Manji. Years ago, he betrayed his corrupt lord, and since then he's killed a hundred men and earned a reputation as the toughest man in Japan. Of course, every other would-be tough guy who wants to make a name for himself is gunning for Manji, but they don't know his secret: a cranky old nun has filled his body with mystical "holy bloodworms" that repair any damage done to Manji's body. He can't die... even if he wants to! Tiring of the burden of immortality, Manji makes a deal with the nun - if he makes up for his past crimes by slaying one thousand evil men, she'll remove the bloodworms from his body. When Manji is hired by an angry young woman named Rin, who is seeking revenge for the murder of her parents, his task is only just beginning!