Anri receives a letter. It contained a concert ticket for a band led by Hoichi Tsukushi, someone that Anri had gotten to know through music.

That's when the robot kaiju Garamon appears from a meteorite that came from outer space.

Anri realizes that Garamon's behavior is controlled by a mysterious sound wave, and she has a hunch...

Gento's son, Jun, wants to go see a newly discovered egg shown on television, so the Hiruma family decide to go on a day trip to visit it. There, they witness the birth of Baby Demaaga. In the midst of the capture operation led by the GGF, the mother Demaaga makes an appearance. The GGF launches attacks as the parent kaiju approaches its baby. While evacuating, Gento can't help but feel mixed emotions seeing Demaaga trying to protect its child. Suddenly, the Blazar Brace appears on Gento's left arm.

The kaiju, Irugo, breaks through the ground and surfaces. The gases exhaled from its mouth are poisoning the human body. SKaRD is ordered by CP to halt all investigation on Irugo and to standby until further orders. Emi thinks this could be the Third Wave, so she proceeds with her investigation involving the Test Facility 66. Meanwhile, the GGF sets out on a mission to cut off Irugo with a self-propelled laser cannon.

Multiple Irugos, which were thought to have been defeated, re-surface once again. As the GGF continues to investigate, a kaiju larger than Earth Garon emerges. Emi comes into contact with her father's former teammate, Nishizaki. Nishizaki reveils the truth about the explosion from three years ago, before Emi heads down to the Test Facility 66 alone. What will she find out?