Suddenly 72 years before portals started opening in this world and Demons and Monster that came out of those portals devastated the earth. Any human weapon was useless against those Demons and Monsters, but luckily humans also started awaken new powers to fight those monster. these humans with special powers were then called THE SLAYERS. In this new world where power was everything, those with no powers were treated as trash.

This is the story about a young boy who was born in very powerful family, but got disowned by the family and was even betrayed by the girl he loved because he was powerless. 

This is the story of Jason who became worlds STRONGEST SLAYER.