After already conquering hundreds of planets, the Great Star League Gozma sets its sights onto Earth. To defend the lands in such a great crisis, the military begins a special branch known as the Earth Defense Force, comprised of elite members from all areas of the military. Under the supervision of Commander Ibuki, the numerous gathered soldiers of the Earth Defense Force begin a harsh training.

The Sky Force sends five highly trained operatives to participate in an experiment which will expose them to Birdonic Waves, resulting in superhuman abilities. But when the Earth Ship is attacked by Vyram, the majority of the Birdonic Waves are sent to Earth and find four unsuspecting civilians. Now, it's up to these four accidental super humans – Raita, Kaori, Ako, and Gai – alongside Ryu, the only original operative to receive Birdonic Waves, to defend their dimension against Vyram.

After a Space Beast throws them off Shuttle Base, the Changeman scramble to get their ship back as Sayaka tries to protect it from the inside.

The Changeman must work with an earthquake institute to prevent Earth from being destroyed in a sea of fire by the Gozma.