Gloom is an ancient wraith trying to earn his way into Heaven by killing demons for an exploitative angel. Wynona is a depressed young girl who is convinced she is the Doom Bringer that will end the world.
His final task is to kill her and she's trying to die - it should be a match made in heaven. But here's the catch: She's unkillable. Gloom and Wynona will have to deal with the agents of both Heaven and Hell if they are going to discover their destinies and escape from their empty and repetitive lives.
And then there's the big dilemma: Should you save the world from a demon apocalypse, or save her soul?