Warumono-san

You were standing on the doorstep of the apartment. You recently rented a room in a nice apartment, but you had a roommate. You didn't know who he was or what kind of person he was. You knocked softly on the apartment door. There were two clicks and the door opened. A pleasant-looking guy of 20-25 years old met you on the threshold. Half of his face was covered with bangs, he was in pajamas. He opened the door wider "Good evening. Are you my new roommate?"

So far, you don't know that he's from another planet and that he's the commander of the League of Evil