My Room is a Dungeon Rest Stop (Manga) Vol. 5

After getting into some trouble with the Mercenary Guild, Touru is whisked away by a hooded accomplice under a cloud of smoke. Even though he's been separated from Ria and Deet, they are reunited behind a hidden Iron Door, where there is safety from their pursuers. However, their saviors end up being members from the Thieves' Guild, and their actions weren't wholly benevolent--Touru and company have something they want!