Death March to the Parallel World Rhapsody, Vol. 20 (light novel)

Satou and his party head to Parion Province where they find the hero Hayato suffering under the effects of a demon lord's curse. But taking down the creature who hexed him will be no easy task, especially since it can alter the interior of its domain at will. After outfitting his party members with some new gear, Satou joins forces with soldiers from both Saga and Parion to route the new demon lord once and for all!