As an adult, Hinako returns to the island of Shikoku, which she left when her parents moved her to Tokyo as a child. Upon her return, she learns that her childhood best friend, Sayori, whom she lost touch with after moving to the city -drowned in a lake at the age of 16. Fumiya, was dating Sayori when she died, and he claims to be haunted by her spirit. As the two old friends begin investigating Sayori's death, they discover a link between a rash of temple desecrations and her priestess mother, whose bizarre actions are doing nothing to help her dead daughter rest in peace!