This is a disclaimer: I do not own Harry Potter or Naruto. This is purely a story based on these titles. All rights respectfully go to the authors of these two fantastic stories.

Prologue:

Everyone has heard of the ninja wars and what they did to the life style of the shinobi, but no one knows what happened after. About fifty years after the ninja wars happened the economy and life style of the ninja was failing so a lone Nin that had faith that the ninja world would not survive, passed through the veil that hid the ninja world from the outside world. There, he made a new life. Chakra was later renamed magic and adopted by those who called themselves witches and wizards. This lone survivor renamed himself Saisei, which means rebirth, because he firmly believed that his family would carry on the ninja legacy. He was mistaken; after a time, the way of the shinobi faded away.

But we got off track; it was he that was the founder of the wizarding world. It was he that founded the ministry of magic. It was he that helped the goblins build the first branch of the Gringotts bank. And it was he that was the richest man in the world and still is. He held Vault 1 at Gringotts. It was called the Uchiha Vault. It was the most secure vault in the world, because it could only be used by a Sharingan holder and none of those were alive anymore. Or so they thought. This story takes place in modern day Britain.

Now, another important thing. There was one person who made a deal with death. He was also a Sharingan wielder. He had seen as the lone Uchiha clan member left and knew that one day he would be needed to train the next generation. The problem was that he was old and dying and he did not know when the next generation would crop up. So when death came to claim him, he made a deal. No one knows how he accomplished it, just that he did. The deal was that his soul would reside in the in-between until the next generation came, in which he would go back to the world of the living at the time that he was in his prime (27 or so) and that he would have all of his powers and memories. That man was Sasuke Uchiha and this is the story of the child he raised when he came back.