A story of how heroes come to the world people live in, saving our lives from demons and any evil things that come to us to take people's soul away. These heroes will stop them in no time.
what if rimuru was instead reborn as a primordial demon the strongest in combat and intelligence.
He reincarnated just before star king dragon veldanava created the omniverse; it was nothing but a void, his soul being exposed just a little to turn null made his soul undergo a change. Making him an individual with a high evolutionary potential