Ais Wallenstein, the Sword Princess of the powerful Loki Familia, is the strongest female warrior to descend into the dungeons below Orario. Within its subterranean depths, Ais and the other members of the Loki Familia discover a strange irregularity lurking in the darkness. As the mysteries of her past and the dungeon’s present unfolds, Ais will fight to protect not just her party, but the fate of the world above.