A side story of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka. It covers the story of the strongest 1st class adventurer, Ais Wallenstein, the "Sword Princess," and her desire to reach even greater heights with her friends in the Loki Familia.
Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka Gaiden: Sword Oratoria has been licensed in English as Is It Wrong to Try to Pick Up Girls in a Dungeon? Sword Oratoria by Yen Press. The first volume is set to be released on October 31, 2017.