The Vigilante Boss and His Failed Retirement Plan( am not the orginal)
I want to make this clear that I am not the original author of this fanfic and own none of the characters mentioned in the story now for the real sypnosis :
It supposed to be a joke, a drastic one where Izuku faked following Katchan's advice to take a leapt of faith. Then the fence on rooftop gave up on him, dying with tons of regret awaken the sleeping sky in his soul. Reminding Izuku that he was supposed to be on retirement for life and the next one- which is this one.
Unfortunately, Hyper Intuition was a bitch to deal with in a world of hero and villain, and he thought he could take advantage of the abundant human resource of heroism in this world. You'd think the world doesn't need more heroes or a Vongola.
the real author is forlorn storyteller you can find his work on archive of our own