Border Camera 3: "The Absolute Realm of Horror!! Psychic Prison Book" was in production, but the director in charge, Narimoto, mysteriously disappeared during the interview process. Then, about a year later, an envelope with an unknown sender arrived, containing an adult video and part of the shooting material for "Shinrei Gokumoncho"... In order to solve the mystery, Kotaro Terauchi is the leader, and the members of "Border Camera" gather again. Involving more people, it develops into a large-scale incident...