Fû-un Lion Maru

The series has its context in Feudal Japan where, for any warrior, more important than life itself was to maintain his honor. It tells the story of Dan Shishimaru, a 21-year-old samurai who, after having his brother Dan Kage Noshin killed by Nezuma, a human monster allied with the evil group Mantle, goes into battle with a desire for revenge and justice.