Naoya was a young shinobi from rain village who quick became chuunin by the age of 10 and was apart of book two. Some viewed him as cursed, he was the weilder of the one tailed raccoon-dog however this was unknown for a long time. He fought incredibly hard even though his village did not allow him to control his sand very well due to the forever falling ran. Though he was smart and adapted quickly to his surroundings.
At the end of the book he formed a giant spear and forced it through Himikiri's heart, ending Himikiri's etetnal life and reverting the remaining vampires to humans.