Astronomer Shinichi Tachibana has a secret identity as the superhero "Iron Sharp" and is well beloved by children. When they are attacked by a group of metallic aliens, Iron Sharp drives the aliens away. The resourceful Tachibana helps develop an electric barrier to block the aliens from coming to the Earth. After several losses by the aliens, they announce that they will invade the Earth, throwing the world into a state of panic.
A group of Okinawan high school girls are drafted as nurses during the American invasion of the island. As the enemy army advances further, the situation for the girls becomes increasingly desperate as food and shelter run out and the number of injured climbs, leading to the film's tragic finale.
When his pistol is stolen, police detective Murakami is humiliated, especially when the gun is later implicated in a crime. Working with his superior, Chief Detective Sato, Murakami works feverishly to trace the location of his pistol, ultimately clashing with a gang of youthful Okinawans.
