Dungeon Battle Royale ~ Since I became a Demon King, I will aim for World Domination

One fateful day, every human worldwide receives a mysterious message heralding the commencement of the World Salvation Project. Skeptical yet intrigued, Kurosaki Shion, a diligent but solitary university student, decides to heed the instructions within the mail. In doing so, he joins the ranks of a million Demon Kings, each governing their own domain in this new world.

Set against a post-apocalyptic backdrop infused with fantasy, this narrative follows Shion on a somewhat dark journey. As he strives for the unification of this suddenly transformed world, the story unfolds with numerous game-like elements and strategic thinking. Amidst the serious tones, there are moments of humor and romantic encounters that add depth to the tale.