During the time of Earl Ciel Phantomhive, he lived with only his servants. His bulter, who is a demon, is the one whom he depends on the most. But what if the demon he made a contract with had not been Sebastian Michealis, but Claude Faustus? The events will unfold that will bring them closer or farther apart, and every step toward Sebastian and Alois. Based on the original manga series by Yana Toboso.