Mt. Hikami was once revered as a spiritual place. It housed a unique religion based on beliefs and customs of worshipping water as a deity and is said to have been a site of many gruesome incidents and mysterious phenomena. This mysterious and intertwined story follows three protagonists—Yuri Kozukata, Miu Hinasaki, and Ren Hojo—as each of them explores the ominous Mt. Hikami, a place where many came to die, and the secrets it hides.