Large footprint sightings in the Tateshina Highlands trigger stories and prompt news reporters to come to the area. Yuriko, however, is not given an assignment. Yuriko learns from an old friend, Ayako, that a rare, Amazonian butterfly called Morpho Menelaus can be found in the area. Ayako's fiancé, Koji, became poisoned by a giant butterfly and later turned into a giant monster.

A 6,000 year-old Statue of Goga is given to the people of Japan as a gift from the Nation of Abu. The statue is soon abducted by a mysterious stranger who also abducts the Ambassador's daughter, Tami. Yuriko, Ippei and Jun investigate and learn that the Statue of Goga is cursed against vice. During a radiological examination of the statue, it bursts open and releases Goga itself!