The year is 1850 and the soon-to-be 13-year-old Karen has to start as a maid at the nearby manor house. But turning 13 also means she can no longer see her best friend and protector of the manor, the goblin Rumle. Therefore, Rumle and Karen are tempted to create a magical Christmas heart together, so that they will be friends forever anyway. But suddenly all kinds of mysterious things and accidents start happening at the manor...