30 million years ago, the world was engulfed in terrifying darkness. But that darkness was sealed deep in space by the Giant of Light. His power spent, the Giant of Light sleeps in the red star, and is forgotten to time.

30 million years prior, a giant of light sealed the darkness and went into slumber in the red star. In the present day, GUTS-Select team was formed while Martian settlement Kengo Manaka lived his life as a botanist. Unfortunately his peaceful life was disturbed by a monster attack at the same time when the sealed darkness started to move. Kengo has a fated encounter the giant of light from the past, whose name is revealed to be Ultraman Trigger.