Fine. It's basically about a guy who dies and goes to a place where a bunch of other people who died without leading good lives are. They all join together and attempt to destroy an evil girl named Angel, who has the ability to destroy them.
However, no matter how many times they get "killed", unless they truly take care of all of their unfinished business, they'll keep on getting back up and living. I guess you could say they're stuck in limbo between life and whatever's after that.
Ah, pot huh? Well, that makes sense.