Each member of the team proposes a different theory as to what is responsible for the odd occurrences. After collecting data overnight, Naru begins to doubt the presence of any spirits and instead theorises that land subsidence is the cause of all the ghostly activity. Mai's classmate, Kuroda, fiercely insists that a poltergeist is at work, and evidence appearing to support her idea soon arises.

Bou-san manages to banish the drowned corpses attacking the base, allowing the team some respite. When the sun rises, Ayako volunteers to purify the spirits and performs a successful exorcism, surprising Bou-san and the other members of the team, but notes another force is still at work. Naru wakes up and the team moves to finish off the unseen force causing the disasters. After the team struggles to exorcise with the spirits involved, Naru uses his own psychokinetic powers and finishes the job, only to collapse afterward. He reawakens in the hospital with the rest of the team, cheerfully visiting him in his room.