Right before Hajime and his companions conquer their third Great Labyrinth, they come face-to-face with Freid Bagwa, one of the most fearsome demons in all the world. Armed with the unique power to create dreadful monsters of his own, he's the toughest opponent Hajime's faced so far. Staking their lives and the whole duchy of Ankaji on the battle's outcome, it's a fight for survival as the dungeon burns, consumed in a sea of fire!