A pathologist, Dr. Warren Chapin (played by Vincent Price), discovers that the tingling of the spine in states of extreme fear is due to the growth of a tingler—a spinal parasite which can kill the host unless it is destroyed by screaming.
After his last tour, Aurélien decides to settle in Japan with his wife Nanako, pregnant with their first child. In their new house in the Japanese countryside, Aurélien discovers an old armor that awakens strange creatures, the Yoka?s.