(Okay so kinda AU Kyuubii never attacked, The Yodiame and his wife just died in an attack on the village. And they never had a son.)
Six years after the Third died a boy appears out of no where at the gates to Konaha. When the boy is taken to the Hokage, the Hokage seems to know the boy and trust him. So the villages brush it off. The Hokage gives the boy a place to stay, and entrance into the ninja academy.
Six years later the boy is in a team. One day the boy accidentally uses an ability he shouldn't know but brushes it off as an 'it was an attack from the enemy not me', expecting his teammates to believe him. The seemingly brush it off but in reality don't believe him at all.
Where did the blonde come from? Why is he so familiar with the Hokage? What is the number one knuckle head ninja hiding? AND WHY AM I ASKING YOU, YOU HAVE TO READ IT TO KNOW!