Life is Full of Regrets

Fifteen years ago, a villain named All for One had a child. Izuku Midoriya. That child received an upgraded version of his quirk, All for One. All for One, or Hisashi Shigaraki, left when Izuku was four, and promised that he'd be back.

Then, there was the battle between him , All Might, and Nana. After realizing the repercussions that would happen after the fight, he fled with his family, leaving Nana Shimura Severely injured, but alive, and All Might with a hole in his stomach. All for One returned just as he promised. However, during the years he was gone, Izuku had encounters with his quirk.

So, let's rewind a bit. Back to when Izuku Midoriya was four.....