In a world shaped by the gods, guilds called 'familia' emerge as hubs for adventurers seeking challenges and thrills. Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka Gaiden: Sword Oratoria unfolds in the bustling city of Orario, where the skilled Sword Princess, Ais Wallenstein, and aspiring mage, Lefiya Viridis, belong to the revered Loki Familia. Renowned for their prowess in hunting monsters, the group embarks on a journey to the legendary tower of Babel, aiming to delve into the treacherous dungeon below. As Ais hones her swordsmanship amidst formidable foes, Lefiya strives to follow in the footsteps of Riveria Ljos Alf, the faction's esteemed vice-captain, and achieve greatness as a mage.