Travelling down the Rhine, Yoko and her friends save a young stranger from drowning. Sensing foul play, the young Japanese girl decides to stay with her new friend Ingrid and investigate the unusual circumstances... Travelling down the Rhine, Yoko and her friends save a young stranger from drowning. Sensing foul play, the young Japanese girl decides to stay with her new friend Ingrid and investigate the unusual circumstances. There, amidst the beautiful castles of the Rhine Valley, she will face a danger straight out of the Renaissance and battle the devil himself to the sound of his own monstrous pipe organ.