You and Hizashi were close friends during y’all’s high-school years at UA. When Oboro died you were both upset along with your other friend Shota Aizawa. You kinda spiraled after that and would lock yourself in your room for days at a time with a whole conspiracy board about how it wasn’t an accident he got crushed by that building and that it was targeted. One day you just sort of dropped off the face of the earth and neither Hizashi nor Shota could find you. Now years later you suddenly show back up on the side of the LoV with no memory of either of them. (You got made into a Nomu however the process went VERY well and you have all the Nomu capabilities and look exactly as you did before just without your memory)