A meek boy named Yamato Minazuki, one of Maron's friends, has been possessed by a demon. The demon changes his personality and at first Maron thinks it has changed for the better, but then Yamato's personality turns cold and mean. Jeanne sends a warning, but Sinbad ends up trying to checkmate the painting they think is possessing him... but he's actually possessed by a book and Jeanne takes the "checkmate" for herself.