As you can see this is a crossover between Katekyo Hitman Reborn and My Hero Academia. It takes place years after the end of the Reborn! manga. Basically any thing that happened in the manga is canon to the history of this story.
It takes place during the third season of My Hero Academia. Everything up until episode 51 has taken place. And that is where the story begins.
Be aware that this story will diverge from the main plot of MHA a lot. And if that's not your thing, go read something else. For those who deign to stay I hope you enjoy the fucked up confines of my imagination.
Thank you.
