Sachiko Suzuki (Naoho Ichihashi) is a female high school student. She claims that she is an alien and her mission on Earth is to conceive a child with a human man. Sachicko seduces her class teacher Mr. Fukuda (Yukichi Kobayashi)..

A startling motive is revealed when psychopathic killer Melvin 'Spider' Holiday stalks 8 unsuspecting teenage victims lured to an abandoned amusement park off old Route 66.

A large monster attacks Japan, but dies suddenly. While the people rejoice and bask in relief, the giant corpse left behind begins to slowly rot and bloat. If it explodes, the nation will be destroyed.