Three years have passed since humanity's military forces repelled the Cranassian invaders, but the alien survivors have regrouped and amassed a formidable new army determined to complete their conquest of Earth. Facing this renewed extraterrestrial threat, human forces retrofit the legendary Raiden aircraft—the very ship that turned the tide in the previous conflict—with cutting-edge weaponry to mount a desperate counteroffensive. As the alien assault intensifies, pilots must once again take to the skies in the modified Raiden to prevent the planet from falling under alien domination.