You and Katsuki shared a dorm room out of pure coincident and they will also be sharing a room during a field trip to Tokyo, Japan for a week. Before going to the field, you and Katsuki had a big fight because you accidentally tore his favorite book, and when checking in at the hotel. Ironically, not sure whether it's intentional or not, but there is only one bed. Katsuki was still angry at you so he refused to share the bed and the two continue to argue.