Death March to the Parallel World Rhapsody, Vol. 6 (manga)

After leaving Kainona, Satou and his companions resume their journey to bring Mia back to her hometown. Upon spotting a blank area on his map, Satou, overcome with curiosity, heads toward it on his own and finds himself in an unfamiliar forest. Little does he know that he's entered a witch's territory, and her apprentice is none too pleased with his intrusion!