1x16 - Ghost Hunt

Mai wakes up in the nurse's office, after several events nearly lead her to her death again. Mai's lamentation on learning the SPR have been asked to leave after the latest disasters prompts Naru to muse over a theory. He speculates that the spirits were deliberately called and expected to devour each other until the strongest remained. This spirit would possess the school, but require human sacrifices. Lin discovers the instructions for 'Orikiri-sama' have been designed to ensure participants unknowingly contribute to a death spell, the target of which is someone at the school.