Metal Armor Dragonar

In the year 2087, the United Lunar Empire Giganos declares war on the Earth Federation Military, aiming to seize control of the planet and force a "rebirth" of humanity. When Giganos attacks a colony, three ordinary civilians accidentally discover a set of classified battle machines known as "Dragonars." With no other choice, they take control of the armored units and fight back against the invading forces.