Cyril Bass is a good-hearted loser who works in a thankless corporate job where everyone takes advantage of him. His social life is also a total disaster; he holds a secret crush for his neighbor Callie but can't even muster a hello as they pass in the hallway. He has a very vivid imagination about how he'd wreak revenge on everyone that's done him wrong, but his morals and ethics keep those thoughts at bay.
Cyril is constantly struggling with his darkest, most sinister side, his own demon. At his worst moment, the Demon entices Cyril to release him, promising revenge, fortune, popularity, and any woman of his choosing. Cyril's life does an about face as Demon slowly takes over, people begin to see him differently as every opportunity opens up to him, and Callie finally takes an interest in him. Too much blood is shed as his decision to release his demon takes its toll; his life is slipping in a downward spiral out of his control.
Now the police are hot on his trail for murders he didn't commit, Cyril must fight his demon to get his life back and save the girl.