The time for Loki Familia's expedition to brave the unknown depths of the Dungeon has arrived, and Aiz must wrap up her training sessions with Bell. While the novice adventurer's secrets have continued to elude the Sword Princess, Bell's improvement under her is unmistakable when the Dungeon pushes him to his limit. Later, as the expedition makes its way to the fifty-ninth floor, Aiz must fulfill her duty to Loki Familia. But déjà vu strikes when she learns a certain white-haired boy is fighting for his life against a minotaur once more...