Yamato is a small country at war with the military might of Mars. In the face of this overwhelming superiority, Yamato's defeat seems inevitable. Even on the island of Gallé in the South Pacific Ocean, where fierce battles are also being fought, Yamato's army is in a state of collapse. Sergeant Tatsumi fights for the survival of his regiment, which is in a desperate situation. One day, just when all hope seems to be gone, he sees an "object" named Kitetsu drop from a transport plane...