At first glance, it looks like an ordinary, slightly realistic fox-colored mask, but... It is actually a Special Grade Cursed Object that was held by a chief priest and exorcism experts; it seems to have fallen into a back alley for some reason. It is a terrifying object that gradually turns a person into a fox. The victim cannot remove the mask until they have completely become a fox, and eventually, they will feel an urge to return to the mountains...