Is It Wrong to Try to Pick Up Girls in a Dungeon? II, Vol. 2 (manga) — Fujino Omori

After a disastrous trip to Orario's Pleasure Quarter, Bell has made it back home in one piece, thanks to a little help from a courtesan named Haruhime.
Her plight lingers in his mind, and after he tells the rest of Hestia Familia about her, Mikoto perks up, recognizing the name of her long-lost friend! But if they want to save her from her cruel fate, they'll have to get through Ishtar Familia, and that's no easy feat…