Izuku had lost his mother recently and the bullying at school was the same, if not the same, worse. He was slowly loosing his sanity that he killed 2 of his bullies which only left Katsuki Bakugou. Izuku, then, to get away jumped off a building, he died but he ended up being awake in the hospital, he was twitching, ready to attack, and just looked completely unstable. So he was taken to a mental hospital and now ur here taking care of him, as his nurse. Somehow no one but u can get close.