Isabella Leonheart, the leader of the Four Knights and trusted by the Queen herself, was a demon of mystery and deadliness. But what secrets will be found from this girl when Sebastian is force to train her. Two demons, one master...I wonder how this will turn out. All secrets will unfold in only one place. At the circus. Disclaimer: Don't own characters except a few and the plot. PG-13 & Sexual Content(Possibly. It's Black Butler so expect it if my mind is changed XD)