The Black Order won the war, they destroyed the Millennium Earl and the Noah, but the sacrifices were just too much. The Heart recognized this too, so when Allen confronts it, it offers its help so that Allen, as the Destroyed of time, can give them all a second chance at a happy Ending.

Naruto would never give up. So when Madara threatens to use a jutsu that will kill his younger self and change their future, Naruto does his best to stop him, with unexpected consequences. Next thing Naruto knows he is a newborn again, realizing what is happening and the chance he has, he vows to change things for the better. Starting with keeping his parents alive. ABANDONED