An ancient artifact that was found in china resides in the museum of asian history, and a scientist discovers
that this artifact is sending out low levels of gamma radiation. He obsesses over it, and in his research he theorizes that this artifact is a portal to a unknown dimension. He believes that this will open new doors for technology for teleportation. Since he is unable to take the artifact out, one night he sneaks inside the museum with a laser that would shoot into the artifact's gems opening a portal. The scientist doesn't realize what is on the other side, he doesn't realize he opened a portal to a dimension where hideous creatures reside, that the Japanese have called them in the past, Oni.