Sealed inside a dimensional sphere is the transformable shell of the Iron Cavalry of the Glamoth Empire. Countless silver mechs were loaded onto warships and flew to the outer rim of the galaxy to fight the ferocious swarms of insects out of deep space.
The Glamoth Empire held a vast territory stretching tens of thousands of light years, and it was always full of ambition toward the far reaches of the galaxy. In the empire's most flourishing era, the queen of Glamoth, Titania, holding supreme power, raised a magnificent fleet and swore to carry the fruits of civilization to every wild frontier, so that they might feel the mercy of the empire and be brought under a single rule.
However, the final expedition failed disastrously before the endless, ferocious waves of insects that came from the other side of the sky. The armies of Glamoth struck back, failed, struck back again, and failed again… all the colonies were scattered, and the steadfast fleet that had once been their pride fell to one defeat after another. Surrounded by legions of monsters with compound eyes and hardened wings, the cries of the people of Glamoth sank into despair, and from then on the sky of the empire was shattered.
Until one day, knights in powerful mechs descended from the sky and swept away the vermin that blotted out the heavens. From then on the silver cavalry traveled to every planetary region of the empire, crossing all the ravaged territories to hold back the disaster that would have destroyed the star system. They were like warriors born to fight the insect swarms. No one knew their true appearance beneath those masks, but their arrival was like gods granting grace, bringing the light of dawn back to the world of humankind. Under the queen's command, the Iron Cavalry of Glamoth roamed the skies and at last held back the enemy's wave of attacks, granting the empire a few hours of rest.
But in that endless war against the insects, the empire gradually came to resemble the enemy it fought: more and more iron cavalry rose into the sky, exactly like the insects that had once suddenly swarmed in and covered the air. The way the people looked at the queen and her knights was no different from the frightened way they had looked at the alien insect swarms. Perhaps one day the empire will win the victory it longs for, but when that day comes, will Glamoth still be a paradise where people can live in joy?
On the frontier of Glamoth, where the war still goes on, the iron cavalry forms the last line of defense. Aboard the warships, the silent knights are given their mission, and carrying the hope of the whole empire, they fight to hold back the enemy's galactic wave of attack.