Gevanni, an odd high schooler who is lifeless and talks contradictory. This is in fact is just a facade. He just wanted to beat the most trending augmented virtual reality game, Herscheim. However, when he met a seemingly real female demon, he was transported into another world.
He can't use any magic nor learn any except he has high amount of mana and locked grimoire. For some reason, he was awfully distrusted by the many because he looks like their most hated God. With his wits and adaptability, he'll clear all of the misunderstandings and learn his powers more—as a half demon. The war against the other six cursed grimoire users begins.