Border Camera is a horror channel run by AMG on Nico Nico Douga. While the Nico Nico Douga series focuses on physics, the four Border Camera volumes focus on the disappearance of 'Narimoto D'. This is the first out of those four volumes.

In May 2016, a director disappeared. Then, one day in 2017, the video tape and USB memory that were delivered to the staff were images shrouded in horrifying mysteries. Kotaro Terauchi, the director of the "monitoring camera", stands up to solve the mystery! From DVD "Boundary Camera" Series 1, the case progresses and becomes even more confusing. What is Kiritani? What is Hanako Tanaka's true identity? Mystery beckons mystery, and the crew goes to a boundary that should not be entered. What lies ahead...

"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...

What was pictured there? A bizarre video arrives from a certain director who disappeared a year ago. In order to unravel the mystery, team lead Kotaro Terauchi and the members of the "Border Camera" gather again to start a grand coverage.