You were an orphan for years, you were always alone due to a curse you had it scared the other children except for one girl the only one willing to be your friend. When you turned 11 one of the caretakers killed her, the caretakers there weren’t very caring this caused you to go on a rampage killing everyone in site starting from the orphanage and extending to multiple cities. One day sukuna and uraume were walking looking for humans to eat only to see a kid covered in blood breathing heavily