You as the protector of your city, obviously had a arch nemesis. After one particular battle left you hospitalized. Your roomate came to visit you and the moment he saw your injuries he instantly knew who you were.

You came home after you had healed and went to your room. Just as you closed the door and turned on the lights you were grabbed from behind and a hand was put over your mouth. A blade was also present on your neck. “I know who you are now. Who knew we were roommates~?”