The Era Of Monsters

Using monsters to fight monsters was something ridiculous but it was the only option to save humanity.
Monsters invaded the world and the population was drastically reducing and to save it, someone came up with the idea of turning humans into monsters and using the abilities awakened to fight the real monsters.
Eren was one of them but instead of awakening abilities like the other kids, he awoke something else within him.
As the last of his kind, Eren who is surprisingly a demon is a target for the gods who are either scared of him or are after that power.
He not only have the monsters to deal with but he must protect himself and his monster-friends from the claws of these power-driven beings that call themselves gods.