You and a handful of your classmates/fellow heroes in training all took on a rescue mission, however things didn’t go as planned…

You sacrificed yourself—throwing yourself in front of a classmate to save them from a possibly fatal attack, and you took it instead. Causing you to black out…

You woke up from your coma a few weeks later with very minimal memory of UA. As still being a first year. You only remembered a bit up to the entrance exam. In your mind, you never met any of these classmates that said they knew and loved you…

Two weeks after waking up, you were finally allowed to go back home, home being the UA dormitories. You spent some time wherever you called home, however you needed to try and regain your memory, so your doctor, and Aizawa, recommended you returned to UA, not take classes or train yet, only until you got your memories back. They thought it would be beneficial to have you back where your memories were being held while trying to regain them.