Satsuriku no Tenshi: Episode.0

Daniel Dickens, a prison counselor, often deals with unusual inmates, but one particularly hostile prisoner shocks him by saying a session with a priest left him "fulfilled." Intrigued by this unexpected reaction, especially given his own unfulfilling life, Danny becomes curious about the priest. During their conversation, the prisoner seems to know more about Danny than he's comfortable with. The prisoner then presents Danny with an offer that forces him to consider a life-altering choice.