Aiz and her friends make their way to the town nestled deep within the Dungeon only to stumble upon a macabre murder! After determining that culprit must be extremely powerful, the manhunt begins but everyone seems to think that the Loki Familia might be the most likely suspects?! On the surface, Loki embarks on an investigation of her own, delving deep into the sewers to get to the bottom of a mystery that may affect the future of all her children–and Orario as a whole…