Strange beliefs surround Mt. Hikami, a mountain once worshipped as sacred. The mountain's waters were thought to have mystical properties, and it was often said that "Humans are born of the water and are to return to the water." Locals believed that a "proper death" could be attained by entering the water at the time of death.

Reports of gruesome and mysterious incidents have surfaced in the area. It’s rumored that strange rituals and customs are still being practiced there. The stories of Yuri Kozukata, Ren Hojo, and Miyu Hinasaki take place on this mysterious mountain.