When a down-on-her-luck student runs out of money – and hope – it’s time for the devil to make his entrance and give her an offer she can’t refuse. But this devil has problems of his own. He’s a cog in Satan’s corporate ladder, who’s quickly losing credibility because that same desperate girl isn’t ready to part with her soul willingly. Now, she’s working at his coffee shop while he tries to convince her that she can have it all. And the cost? Merely her mortal soul...
The protagonist of the series, Hanna, is a poor college student who struggles to get by. She is approached by Number 4, who promises to give her a wish in exchange for a soul, and this pulls her into the world between heaven and hell.
The deuteragonist of the series, Number 4 is a high ranking devil whose job is to make contracts with humans. He meets Hanna in an attempt to get her soul, but it proves harder than he anticipated.