A young pilot named Daisuke Aramaki commands Grendizer, a transforming spacecraft built from alien technology, while hiding his extraterrestrial origins on Earth. When hostile forces from space close in on his adopted planet, Daisuke must protect the people he's come to care about while concealing the truth about his past. The line between his human life and his cosmic destiny grows dangerously thin as enemies converge on multiple fronts. What began as a refuge becomes a battlefield, and Daisuke realizes that running from his origins is no longer possible. With his mecha as his only real weapon against invaders who refuse to let him go, he faces a choice between disappearing into the stars or making a stand to defend his chosen home. Grendizer roars to life for a desperate confrontation that will determine whether Daisuke can forge a future that honors both halves of his identity. The setting sun marks the beginning of an impossible fight.