A high school student preparing for his university entrance exams is discontent with various social inequities and is determined to take vengeance on all adults. According to the press information accompanying a 2005 retrospective of Kōji Wakamatsu‘s films, the individuals using the “Yoshiaki Ōtani” pseudonym for the screenwriter credit on this film are Yasuaki Hangai and Mikio Terashima.
A prehistoric monster called Gigantis emerges alongside another creature named Angurus.
Two fishing scout pilots make a horrifying discovery when they encounter a second Godzilla alongside a new monster named Anguirus. Without the weapon that killed the original, authorities attempt to lure Godzilla away from the mainland. But Anguirus soon arrives and the two monsters make their way towards Osaka as Japan braces for tragedy.