Origin: The tavern, named "Guixu," is the embodiment of the first "bond" to appear when chaos first formed. It exists in the "Land of Nowhere," between the myriad worlds.
Rules: The tavern serves only "those destined to find it." The tavern itself decides who qualifies. (At first, the protagonist thinks it's random, but later discovers that the tavern has a will of its own.)
Currency: Not gold or silver, but "stories." A guest's memories, secrets, obsessions, and karma can all be exchanged for "the price of a drink."
Upgrade Mechanism: Collect stories from the myriad worlds → unlock new drinks → attract guests of a higher level → expand the tavern → unlock passageways to new worlds.