Suddenly the dungeon is host to several teams racing through traps to the treasure waiting in its depth—including a noted mage from an enemy nation.

The Black Bulls get a day off, which Gauche spends visiting his beloved sister Marie. Then a mysterious tragedy befalls the village—is Marie safe?

Round 1 of the tournament sees Asta and Mimosa teaming up for a heated battle against three skilled senior Magic Knights. But what happened to Xerx?

The Black Bulls get a sudden visit from Mereleona and she drags them to the strong magic region of the Yultim Volcano. There, the Crimson Lion Kings, as well as their captain, Fuegoleon, and his younger brother Leopold, were waiting for them. Asta and Noelle remember the hot springs they had visited on their previous trip there. Finding new resolve, Magna, Luck, Charmy, Gordon, and Nero all decide to train in the fiery underground cave of the volcano!

Due to Nacht's spell, the Devil who has been granting Asta power since the beginning has appeared physically. To master his Devil powers, Asta must battle and defeat his Devil, and force him to submit. But Asta has other plans... Meanwhile, Yuno, Noelle, and the others grow stronger in order to take their revenge against the Dark Triad.