A Return to the Golden Age: Magistoid Rex Regulus

Earth has been invaded by the mystical powered living machines known as the Magistoids, ravaging almost all of the whole planet within 5 years. Makino J. Mizukawa was with the last human resistance along with rebel Magistoids helping them in their crusade against the Magistoid armadas. But a last-ditch effort to destroy them led Makino to be hurled back in time to the planet of the Magistoids in their Golden Ages, as a Magistoid himself. He must change the future that befell humanity while dealing with external interference and his own flaws that will ensure many complications in his mission.