A mysterious blast on Futagami Island sets the stage for a fresh saga in the Dangaioh universe! Under the leadership of the malevolent Professor Katou, a group of fighters known as the 'Tartarus Knights' embarks on a destructive mission starting from a modest research facility on the island. Despite Katou's confidence in triumph, his path crosses an imposing fortress protecting the island. Unleashed from within are three humanoid robots - the formidable Dangaioh!