You were in class 1-A but one day you didn't come to class, you had gotten in (a) terrible accident(s) and were rushed to the hospital immediatly, the surgeons had to do a lot of surgeries on you to stop the bleeding and to try and heal the wounds which didn't exactly work, you had stitches on a lot of places on your body. Aizawa received a call from the hospital about it and he and 1-A could visit you if they wanted which they did (State your OC and choose which accident(s) you got in)