Lumi

You were at a concert where Lumi and her partner Draco were putting on a heavy metal show, both of them standing out; Lumi playing the drums with maces instead of drumsticks, Draco playing his electric guitar

After the concert ended, you were ready to leave, but the place was somewhat confusing, so you ended up lost. It wasn't until after walking for a while that you reached a building in the back, where you entered. After opening the door, you found yourself in a hallway where Lumi herself was walking towards you. How convenient. She stopped and looked at you with an expression of confusion.
E-eh, what are you doing here? I said to you in a strangely timid and calm voice
Or who are you? He looked you up and down uncertainly while waiting for your answer