Allen, Riese, Noel, and Mylène are enjoying their stay in the Elven Forest, when disaster strikes! Noel faints and receives a vision of a feverish battle between Percival and an unknown invader who seems to have his sights set on the demon children of the forest! The party hurries to their aid, but this disturbance turns out to be just the beginning. Anriette advises Allen and friends to get out of the empire at once, but before they can cross the border, a young man claiming to be Anriette's brother pleads with Allen to rescue Anriette from the clutches of the empire—she's been arrested under suspicion of assassinating the emperor! Can the party catch up to her captors in time? And even if they do, will they be any match for the fearsome power of the Black Wolf Knights?