A year has passed since the battle between Gamera and the Gyaos, and Japan has struggled to rebuild its cities in the meantime. The military has kept a cautious vigil on the nation's coast, but so far Gamera has yet to return. Suddenly, a series of bizarre incidents reveal a new threat to earth science instructor Midori Honami watches as a huge meteor plunges into the mountain snow.The meteor has carried with it a species of extraterrestrials nearby soldier names them "Legion," after a Biblical demon army Japan's military and scientists race to find the Legion's weakness up to Asagi Kusanagi, a young girl with a spiritual connection to Gamera. to save humanity.