Upon reaching the lowest point of their lives, humans known as "signers" form contracts with spirits.After a tragic event that almost wiped out all human life, those approached by spirits wanting to form a contract, "signers", began to appear in society. Seth, a down-on-his-luck young detective in the largest mega-city on Earth— the Garden— becomes one of them after being mysteriously murdered. Now unable to die, he searches for the killer and the truth behind his contracted spirit, but he soon realizes that the reality is far more painful and dangerous than he believed. Only time will tell if his inability to die will be a blessing for him... or a devilish curse.