On the dark path of swordsmanship in a "futuristic" yet feudal Japan, it is said that the one who becomes the No. 1 warrior will rule the world with powers akin to a god. Only the No. 2 warrior is allowed to challenge the No. 1, but anyone can challenge the No. 2. The current No. 2, the Afro Samurai, travels the road looking for revenge on Justice, the man who murdered his father (who was then the No. 1) in front of him when he was just a boy, a skilled gunman who became the current No. 1 after defeating Afro's father.
Afro Samurai is a pretty gangsta anime.