In a city that is neither small nor large, there is a mountain that people avoid. This undeveloped mountain is not protected by a green belt, nor is it a site of environmental conservation. The avoided, prohibited forest... With its dismal atmosphere and the rumors whispering of spirits, it is called Spirit Mountain. On the mountain stands a house, a renowned residence of mediums that displays their long, glorious history of heritage. Thus, it was once known as Medium Mountain. But long ago, it was said that a Nine-Tails lived there... and it was known as Fox Mountain. But now, 20 years later, a dark aura covers this isolated place...