Shikoku.

Years after moving to Tokyo with her parents, Hinako returns to her hometown in rural Shikoku. She soon learns that her childhood friend, Sayori, died several years ago and that Sayori's mother, who used to perform seances and exorcisms, has gone almost insane with grief. After seeing Sayori's ghost several times during the night, Hinako consults with some local experts on the paranormal and discovers that Sayori's mother has something planned for her daughter...