A peculiar sound echoes through the sky. Those who hear it faint, and eventually vanish. Expert team GUTS-Select investigate but are met with attacks from an alien army and a pitch-black mobile fortress, Zorgaus, piloted by Professor Gibellus who seeks to rule the skies of Earth. As Kanata and crew find themselves in trouble, a mysterious woman who knows Gibellus suddenly appears. The woman, Dinas, possesses a mysterious power. Sharing the duty to protect, Dinas and GUTS-Select work together to foil the evil scheme, but a barbaric Galactic Empire Beast descends and stands in their way. Kanata, Dinas, and GUTS-Select begin an all-out battle to decide the fate of the Earth and entire galaxy!