Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka III OVA

A new natural hot spring opens in Orario under the management of Dian Cecht Familia, promising adventurers a rare chance to relax. Naaza of Miach Familia, however, suspects that the supposedly miraculous spa is hiding an elaborate business trick and sets out to prove it. Bell is, as usual, in exactly the wrong place at the wrong time and gets dragged into the investigation. Instead of a quiet visit to the baths, he becomes caught in the long-running rivalry between two Familias, complete with accusations, competition, and increasingly strange tests. In Orario, even taking a bath can somehow turn into a full-scale adventure.