A Monster to Monsters (HDN x Pacific Rim)

There exists a world which is known by the locals as Gamindustri. In this world, four goddesses rule over their own nation. These four, known as "CPU's", have grown to be quite close friends. These goddesses protect their nations and occasionally help the others too. They ensure peace.
However, unknown to anyone in Gamindustri, there also exists a monster. One that stands taller than any of their structures. With a shell made of metal and a heart made of gold, this monster is only feared by those that the CPU's cannot handle. Giant beasts cower at his name and revere him. Although, the metal monster has made an oath to himself that he shall never let his existence or that of the giant beasts be known to any of the humans of Gamindustri.
But one day, he found out the hard way that the giant beasts are getting stronger and evolving. He soon realizes that in order to keep up his fight, he too must evolve. After a fight with a particularly strong beast, he sits and rests in a secluded forest, hoping to regain his strength and repair. But suddenly, he hears a small and feminine voice call to him. From that point forward, his oath has been broken for him.

A/N: Okay, I know I already have two other stories ongoing, but I've been wanting to do this one for a long time but was always too busy. But now, I just don't care anymore, I'm doing it. I hope you'll enjoy!