Misaki Saiki is preparing for her S&M club job. The events of a mother who apparently killed her daughter Miku and herself are shown. Souichiro Kadotake of the Social Work Division picks up Misaki to deal with ghosts of the woman and her daughter, and then waits in the car outside. Inside the apartment Misaki finds a man about to rape the mother’s younger sister, Ai. Misaki intervenes, and is saved at the last moment by Souichiro, but the killer escapes. They receive some photos of the man escaping taken by Mitsuru Fujiwara who then texts them the man’s location. Misaki learns that the man was Koga, who was living with the woman, Po, and who murdered Miku. Misaki, Souichiro and Ai find Koga and his gang. In the ensuing fight, Koga flees, but Kinue, Misaki's mysterious demonic familiar and guardian, attacks and kills him, freeing the spirits of the mother and daughter. Ai sees Mitsuru leaving and recognises him as a student at her school.