Throne of the Abyss Blade of Godslaying

Karen, a fallen noble betrayed by his beloved and exiled by humankind, accidentally awakens the supreme bloodline of the Abyss Demon Lord. He joins forces with a cursed lamia monster girl, battles his way back to the royal capital from the pitch-black abyss, swearing to destroy the hypocritical gods and divide the sun—the symbol of power—equally among all races across the world.