A magical homunculus, a renegade princess, an ex-mercenary, a dethroned emperor, and an inventor discovered a device that lets them travel to other realities. After a minor malfunction, they're permanently blocked from re-entering their home.

Constantly travelling through the infinite interconnected web of alternate worlds can get a little boring sometimes. So why not have a little fun?

I suppose 'fun' can be rather subjective, though.