With Sirius locked in Azkaban for betraying the Potters, Albus Dumbledore sees no other choice but to place young Harry with his muggle relatives. Much to the headmaster's surprise, however, another lays claim to the boy and though he attempts to prevent it, Harry Potter will be raised by the last of his magical family, but not one bearing the Potter name... Durmstrang story

A man well suited to being a shinobi is reincarnated into the Naruto world at a key stage in its history, not knowing what is to come how will his actions inadvertently effect the future. OC-insert