Sarada was transported by the Nanadaime Hokage to a safe place, but it doesn't happen, in the other hand, somehow, she was brought back to the past, where the 7th Hokage have the same age as her.
Minato take care of Naruto after Kushina die on the day of the Kyuubi Attack, making his max to protect his son, but he won't be the one to do it, a certain girl with blank eyes will help on it too.