Episode #1 A powerful storm is raging in the dead of night, and a transport vehicle carrying uranium is forced to stop due to a landslide blocking off the road on the mountain pass they were traveling on.
As the driver tried to contact the transport's headquarters, a second landslide from the heavy rain comes crashing down onto the vehicle, sending it over the edge of a cliff and into the sea below.
One reporter, Goro Ryouji, nicknamed the "Suppon", arrives late, much to the anger of his boss, but he reveals that he's following up on the transport vehicle's crash.
Detective Yamato arrives to ask Dr. Ukyo if there have been any readings of radioactivity, to which the doctor nods and wonders if the vehicle was completely washed to sea.
As the three talk, they begin to hear strange roaring noises near the mountainside, which one of the police officers refers to as the "Tengu's Great Trumpet Shell", a large cave that funnels air in such a way to produce the sound.
Goro and the others suddenly begin to hear a loud noise behind them, likewise noticing that one of the Geiger counters pointed out towards the ocean is reading levels off the scale.
With no issues with the uranium fuel, Goro, Yamato, Dr. Ukyo, Satsuki, and several other scientists make their way towards the beach and begin to pick up high radioactive readings.
As Satsuki regains consciousness, the three look on as Agon reaches the Research Center and begins to destroy it, easily demolishing any building in its path.
From their safe vantage point, they stop and watch as Agon strikes and cracks open the nuclear reactor of the Research Center, and Goro and Yamato are convinced that the radiation spilling out from it would be enough to kill the monster.
Dr. Ukyo reveals that he believes that, due to the monster's "birth" from radioactivity, the explosion of the reactor did little more than feed it, and that as long as uranium exists, Agon will continue to try and obtain it.
A plan is devised by the military to take advantage of Agon's behavior, luring the monster out from the sea with uranium fuel in order to attack it.
Tank and cannon fire from the shore quickly followed, but like the jet fighters, their attacks weren't able to deter Agon as it continued towards land.
Dr. Ukyo suggests that they all head toward the shore to further examine Agon's behavior, arriving just as the monster strikes down a lighthouse overlooking the ocean.
As he tells them that he must go to inform his neighbors, the elder brother insists that he keep things quiet until he salvages their suitcase once Agon leaves, and threatens him with his gun that he do what they ask.
Soon, the helicopter approaches Agon, which remains unusually motionless as the rescue crew make their way down to the boat still held within its mouth.
Suddenly, the monster swats at the rope ladder and pulls the helicopter down to the ground, destroying it before moving off from the top of the mountain it was sitting on.
Satsuki manages to comfort him, telling him that the military chose to follow with his idea because it was the best they had available, and that they need to come up with another plan so that the crew's deaths weren't in vain.
Dr. Ukyo and Yamato decide that, in order to save Mie City, they will lure Agon away using a helicopter with a large quantity of uranium suspended underneath it.
The monster quickly turns toward the uranium being suspended overhead and begins to follow the helicopter as it is led away from the plant and back towards the ocean.
Agon leans down and drops the boat from its mouth as it begins to pursue after its food, freeing Monta from its grasp.
The drugs quickly take effect, and Agon begins to stagger aimlessly through the steel manufacturing factory, catching itself on fire as it destroys the plant's furnaces.