Naruto Worlds of Fate

Replace Shiro with Naruto and you change the story. While training in a different world Naruto stumbles into the Holly Grail war. Now Naruto, as Kiritsugu's adopted son, will wreck havoc in the Grail war while he continues to train under Jiraiya. Will include more fate series in the future. This is going to be a harem story. Rated M for possible lemons in the future.