In the year 2087, the United Lunar Empire Giganos launches a war against the Earth Federation Military, aiming to dominate the planet and initiate a human race 'rebirth'. Amidst an invasion of a colony by Giganos, three ordinary men chance upon a set of clandestine Metal Armor machines known as 'Dragonars'. With these powerful weapons at their disposal, they engage in fierce battles against the invading forces.