Der deutsche kaufmann über see

While Yuuki and her band of friends continue on their quest to save Takamagahara, the balance between the dream world and the real world is thrown into turmoil. Japan's municipal water unexpectedly turns red, and the stream of clues leads to a murky pond in which all of the fish have gone foul. Will Yuuki's magic be enough to solve the msytery behind this crimson-colored killer?