A female teacher at Minamibuchi High School left traces of a curse before committing suicide. After being taught the meaning of the sigil during a mass, Eri also hears rumors related to the school. "There’s a teacher who disappeared a few years ago and was never found." Intrigued by this rumor, Eri heads towards a normal house with a sign reading "Omura Clinic" in order to uncover the truth behind the rumor.