When Naoko was a freshman in high school she was kidnapped and imprisoned by a man who lived next door. For one month, she went through hell. Finally, she killed the man and escaped. Now as an adult, Naoko is a doctor specializing in infertility treatment, but she also has another side. Naoko is a popular master in a S&M club.

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