Fifty years ago, the Light Sword Hero sacrificed everything to seal the New Gates, saving the world from destruction. But after his death, peace was only temporary. Now, the seals are breaking, monsters are returning, and the mighty Aurexia Empire has begun summoning heroes from another world in a desperate attempt to save humanity. Among them is a young man who appears completely ordinary. No one knows that one day, he will walk the path of shadows and rise as the Shadow King.