Black Butler X.

His royally sanctioned dinner party a shambles and a murderer on the loose, Ciel Phantomhive is a veritable prisoner in his own home, alongside those of his guests who still live. And in the most shocking of turns, the young earl finds himself now without his indispensible manservant, Sebastian. Never one to take misfortune lying down, Ciel seizes control of the investigation into the suspicious deaths. But as the mystery deepens, there happens upon the young earl's doorstep an odd priest, wearing an insolent smile and an inverness cape, which flaps and splashes being him... Is this mysterious thirteenth guest the perpetrator of the crimes that have bloodied the halls of Phantomhive Manor?