A detective's assistant awakens with no memory of his past after being found unconscious at a cliff's edge, and upon recovery encounters a young woman named Ayumi Tachibana who reveals his true occupation. She directs him to the Ayashiro estate in a remote village, where he must unravel the circumstances surrounding the death of Kiku Ayashiro, a member of the prominent family that controls vast hereditary lands. Local folklore speaks of a curse tied to the family's treasure—a belief that the dead will rise to punish those who covet it—and as the assistant detective delves deeper into the case, he finds himself confronting a series of brutal murders that seem disturbingly connected to these ancient warnings. The investigation becomes a race to separate superstition from sinister truth while battling both the village's dark secrets and his own fractured past.