Manga The Beginning After The End

The Gray King was the most powerful in a world where only strength matters. All creatures here fought only for the throne and glory, for which the most sophisticated and cruel methods were used. However, it was the king who won the victory! True, no one knows his great secret. It turns out that the king does not really see the point in all this, and wants to live a quiet life. As a result, he will be given a second chance, because he will be reborn in another world, but even here everything will not be as cloudless as he thought. Magic and monsters are strong in this world, which means that there are many threats in it that can destroy everything. How will he act to save everyone?