The giant monster reveals itself at last, and proceeds to burn the town of Atami! But, in truth, this is all part of the Mayor’s scheme of economic revival…

As the authorities’ evil scheme threatens Oceanographer Nanami, SV2 sits on the sidelines in uncertainty. There is also a rather dubious movie director, who may or may not know the source of the escalating monster crisis. As the Self-Defense Forces are dispatched, the Ingram’s Revolver Cannon fires, and the truth of the giant monster will become clear!

“A time bomb is planted inside Special Vehicles Section 2!” The members of SV2 are perplexed by that sudden, mocking telephone call, while an aviary explodes in Yamazaki. However, that warning was just the beginning…

After a huge explosion is triggered in the Section 2 offices, a search for more bombs is launched. Policemen dig through many contraband items, and after finding one bomb, another big explosion erupts. Reluctantly, an evacuation order is issued for SV2. But a jumbo-sized bomb still sits in the building… how many more triggers for it are there, and where are they!?