With the 31 Primevals defeated and their sinister plan to zonderise the universe thwarted, it seems humanity is finally safe from alien evil-doers. In this time of inter-stellar peace, the Gutsy Galaxy Guard is battling the crime syndicate BioNet and their mysterious Q-Parts technology until Mamoru, son of Cain, suddenly returns to Earth! Things become confusing, however, when Mamoru attacks the GGG orbital base and steals their acquired Q-Parts. Why is Mamoru now fighting against his old friends? And could a new, even more powerful alien threat be behind all this?