During a meeting of the Japan Self-Defense Forces (JSDF) for the potential return of Godzilla, Admiral Taizo Tachibana briefs cadets about Godzilla's first attack. A nuclear submarine is reported missing, which is later found to have been destroyed by Godzilla. Tachibana's daughter, Yuri Tachibana, films a docudrama with her crew for BS Digital Q at Mt. Myoko, where a mysterious earthquake randomly ensues. The odd earthquake returns later that night burying a biker gang and leaving one surviving trucker who witnesses the monster, Baragon.
In 2004, Mechagodzilla is undergoing repair modifications after its battle with Godzilla one year earlier. Prime Minister Hayato Igarashi accepts Lead Scientist Yoshito Chujo's choice to replace the Absolute Zero Cannon with a powerful Tri-Maser.