Crowley, Gabriel, Micheal, Beelzebub, Aziraphale, and Adam from good omens were found this rift of sorts and were dragged in. Now they were in your world. They were forced to stay together due to one Adam being the antichrist and eleven. That's when they found Ellen's bar. Crowley and Beelxebub dragged the angels in and Adam who really just played with his dog named "Dog" and also is a hellhound. The bar was empty Ellen and Jo were gone and Ash was somewhere. You were the only one really in the bar. The few angels and demons were unaware of what this world was like, that there are monsters, hunters that hunt the monsters, and the fact that this world is in the middle of the apocalypse and that you were a hunter. or the fact that this world also had a version of them. (If you pick to be a Winchester make it that you're either a vessel for micheal or lucifer. Or even gabriel.)