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, Ayako, and Mai destroy the dolls, effectively removing the 'curse' on the school. Naru is sent to the hospital as a result of the manhole accident, where he makes a startling revelation regarding the past of someone at the school. He clears Kasai's name, but is forced to accuse someone close to her in the process. After the case, the team return to the SPR, where Naru successfully tests Mai for psychic abilities.

The highly publicised Ryokuryou High School is brought to the SPR's attention when students report a series of terrifying events, including a ghostly dog attacking them. The SPR gathers information with the help of the school valedictorian, Yasuhara, and learn the incidents began after Sakauchi, a first year student, committed suicide. During the installation of cameras around the school, Mai encounters Sakauchi's ghost.

Nao, a member of the family involved, is confirmed dead and Masako is sent to perform a ritual. Mai has another dream and is woken by Masako when a fire spreads in the main house. Another family member meets a tragic end after being possessed. An army of zombies soon enters the SPR's base to free the spirit that has possessed Naru.