"Aiz and Hermes Familia have joined forces to eliminate the monster outbreak in the pantry, but an unexpected dead end forces their expedition into uncharted territory. Unusual changes are disrupting the delicate balance of the Dungeon, and Aiz finds herself alone against her nemesis, the red-haired Tamer. Will her recent rank-up give Aiz the edge she needs to fight this battle on her own? And without Aiz's support, what will become of Hermes Familia...

"After the dangers of the battle on the fifty-ninth floor, Aiz and party expect their journey back to the surface to be a piece of cake. Unfortunately for Loki Familia, the Dungeon has additional trials in mind... Faced with dwindling supplies and many wounded companions, the expedition team takes shelter in Under Resort on the eighteenth floor to rest and recuperate. They've just begun to formulate a plan when an unexpected visitor arrives-none other...