Seijou Horie was just a regular kid, going to school, working, and hanging out with his friends, until we moves in with his uncle for a year and learns how he can change society for the better(MHAxPerson5)
Ren Amamiya was born quirkless in a world where that is no longer the norm. Holding his own sense of right and wrong, he befriends Izuku Midoriya who is also quirkless. But a chance encounter with a villain threatening to kill them awakens Ren to his persona, setting him down the path of becoming Joker, the Phantom Thief Hero.
Akira is prosecuted for a crime he didn't do it. As a punishment, the government sends him to study at U.A where he would be surrounded by heroes to keep an eye on him. While there he meets other outsiders and they all agree to join him in this mysterious quest through a mysterious world and be the saviors that the pro heroes forget to help, under the name Phantom Thieves.
After Operation Phantom's Fall, Phantom Thief Joker was Aprreheded by the Authorities. Only Left with Two Choices, Either be Sent to the Super Maximum Prison Tartarus, or be rehabilitated at U.A.