5 year old Naruto Uzumaki was running for his life. Some villagers angry on his tail.
„Kill the fox monster! Get him! He won't escape this time!"
Villagers caught up to 5 year old boy and beat him up.
„Shit! Hokage's ANBU is coming! That geezer Sarutobi doesn't like when we beat the monster brat! Let' do something!"
One villager formed hand seals: „Space Manipulation no Jutsu!"
Beaten to bloody pulp 5 year old Naruto Uzumaki was banished from ninja realm and landed in Fuyuki city. Just when Kiritsugu Emiya has destroyed Holy Grail and everything was burning. Naruto was at least as lucky as he landed right on half burned red haired boy of 5 years old.
Shirou Emiya did his first and last heroic deed by shouldering Naruto's landing and died in his stake.
Beaten and bleeding, but Naruto was a ninja. So he got up and managed to get quite far before collapsing. This is where Kiritsugu found him, thinking Naruto was survivor of fire.
Kiritsugu took him in and raised him as his own son. All things Naruto had said about ninjas were chalked up to his trauma in fire. But Kiritsugu knew Naruto was strong so he trained him in the arts of wizards and Naruto combined his basic ninja skills with them and became great.
Ten years passes. Kiritsugu passes away leaving Naruto alone with his sexy adopted sister Fuji. Now time is ripe for next Grail War!