Ever since Eliana became Ciel's Nanny they were inseparable. She cared for Ciel as if he was her younger brother and loved him with all her heart. They lived a happy life until the accident... After getting kidnapped by unknown men, Eliana tried her best to protect her master from harm. She would even die protecting him. And that's exactly what she did. But death didn't come to her that easily... After making a deal with the devil, she became a half-demon. She will now live her life immortal protecting the one boy that gave her life. After all what good of a nanny would she be if she was not by her master's side? Who else would sing him his lullaby?