The planet earth has been invaded by the tyrannical and imperialistic forces of Carnass. You have witnessed the populace of the planet earth's decimation, the scorching and ransacking of cities, and the defeat of earth's mightiest defenses. The future of the earth looked dim, that is until the creation of the world's last hope, the innerspace fighter bomber "Raiden." You have been selected to pilot this incredible weapon and defend your home world.