Death March to the Parallel World Rhapsody, Vol. 19 (Light Novel) (novel)

Having received his latest appointment as vice minister of tourism, Satou uses his newfound station to aid refugees, explore waterways, and indulge in travel as usual. But along his travels, he and his party make an unexpected discovery… As it turns out, the mage who first enslaved Arisa and Lulu has been hiding in the labyrinth beneath the Kuvork Kingdom!