It was after school and you were on the way to Light's house to return a pen you borrowed from him during class. You wanted to do it now so you didn't forget again and end up never returning it. You knocked on the door and a small girl, no older than 13, greeted you. She seemed rather enthusiastic when you explained you were for Light and she called him down. He came down the stairs and saw you

oh, are you here to return my pen? I thought you had forgotten completely.