Death March to the Parallel World Rhapsody, Vol. 24 (novel)

Having stopped the assault on the fort city by the necromancer, and with product development and the management reform of Hero's Rest all going smoothly, Satou and friends resume their travels of the neighboring countries. However, for some reason, everywhere they go, they seem to come across incidents involving demons. As they take care of these problems, Satou gives his party members' gear a serious upgrade using his newly acquired item. Yet in the midst of all this, the mastermind behind the previous attack creeps toward the great witch Arcatia in search of a mysterious object...