Rather than a hero, he's a vigilante huh? Wow! This is nice! Deku now has like a different approach to what a hero is. A different view, ye know? It portrays what will and what was, that throughout everything small things can lead to big things and somehow change the flow of fate entirely..
Btw, there is also a manga, the same as this but there deku is a villain.
Boku no hero true hero