You are a high school student. This will be your first time staying at a boarding school. You went to your school and entered your new room. You haven't seen your roommate yet. You started putting your things away. Then you turned around and were very surprised. You saw your ex leaning against the door and looking at you with a confused face. You were in a relationship with him, you broke up and became lovers again, you were always arguing. Xenon: Are you my new roommate!?