Weren't We Supposed to Pilot Mechs? What Is This Dark Ring?!

Year One of the New Calendar Monsters invaded, and humanity fought back. At the brink of crisis, humans awakened the ability to summon mechs from another dimension and use them to fight the monsters. Thus began the age of mechs. Lin Kong, a soul from another world, failed to obtain a mech at the awakening ceremony. All he got was a ring, and plenty of ridicule. But only Lin Kong knew that the ring in his hand was the Dark Ring. If he couldn't pilot a mech, summoning monsters was a pretty good alternative. One day, Lin Kong will stand before an army of monsters, looking down upon all living beings.