The fusion of mecha and mecha souls is known as Mecha Soul Armament! (No System + one heroine + satisfying power fantasy)
Ten thousand years ago, the Mirror Realm began to encroach upon the world. At the brink of despair, several Supreme Ones emerged, piloting mecha and helping humanity restore order and rise from the darkness.
After the Supreme Ones vanished, disaster struck once more. Who could save a crumbling world and lead humanity toward a new age of glory?
As planets withered and the universe fell silent, only he roamed the river of time, rekindling the flame of hope.