After a nuclear war, society breaks down into two groups, the evil Euraks and the rebel Federation. A mercenary named Parsifal is hired by the Federation to infiltrate New York City, which is controlled by the Euraks, to rescue the only fertile woman left on Earth.

A documentary is shown on TV of group of teens who investigate the legendary forbidden zone, in which a Demon infestation once took place (see Demoni I). When finding a lifeless corpse of a demon, one of the teens causes the resurrection of it, and the demon makes it's way into the nearby world by TV-broadcast… An unlucky girl, having her birthday-party at that time, gets possessed by the demon while watching the documentary and soon the entire building in which she lives turns into a living nightmare….