The Sage and the Slayer

After Naruto's meeting with the Rikudo Sennin, he awakens the power of the younger brother, Ashura, and ends the Fourth Great Shinobi War. Now having left the continent he travels the world like the Sage before him and spreads the teachings of Ninshu. His travels lead him to a continent of warrior woman who's sole monarch is decided by martial prowess in a life or death tournament.