Welcome to Pacis Urbs, a city that takes the best of all worlds for itself.
And, yes, that includes you.
You've been taken quite by accident, you see, but you're hardly the first Otherworlder the Natives have had to deal with. Pacis Urbs has a long history of accommodating Others like yourself, and getting them back home. The only problem is, getting you back is expensive. How can you earn the money to get home?
The Games, of course. These gladiator-esque games are wildly popular in Pacis Urbs and other cities, generating much of the city's income. While these games can be light, even humorous, the darker games involving death pay more. Getting home isn't cheap, and there are plenty of ways to sell yourself on the Campus.
Isolated from the rest of the city, collared and marked as an outsider, you're stuck in this world until you can pay off your debt.
The only question to ask yourself now is: what will you do to get home?