Close Eye on Your Enemy.

Sebastian, Ciel, Evangeline, Skylar, and Eryn are not very acquainted with each others presence. Eryn is a Phoenix Archdemon who has been given the task by Lucifer to keep a close eye on three specific demons named Sebastian Michaelis, Claude Faustus, and Damian Falcony. Plus four reapers will try to interfere with Eryn's task and they are the Undertaker, Ronald Knox, William T. Spears, and Grell Sutcliff.