The setting is Middle Ages, a time where peace and war is jumbled together. It is during this time that utility people called "Adventurers" came into existence. Monster extermination, ruins exploration, getting back stolen goods, etc. As long as you have rewards and policy, they're an extremely useful existence.
To those people, weapons and goods necessary for adventure are sold, requests are dispatched and wounded bodies are tended and nursed. An extremely essential existence for them adventurers that is, "Adventurer's Bar".