Throughout history, humanity has been plagued by traces of the supernatural. However, in recent years the number of paranormal creatures spilling into our world has increased exponentially thanks to one group. The Djinn. Some call them demons, evil spirits, wishmakers, Sin Incarnate, or occasionally guardian angels; whatever they call themselves, though, they have one purpose. To make deals. Thus, GA5-1921 was created, a group of government agents each making deals with one or more of these beings in an attempt to quell the threat with the powers acquired. Sometimes they get by with a flash of a badge and a well-pressed suit, but most are prisoners, outcasts or those simply taken by the program because no-one would miss them wearing simple street clothes and hoping they can bullshit their way into a new case.
Whatever their circumstance or the words of their contract, the squad has one job. Uncover the truth, and exterminate the problems.