Butterfly was known as the circus princess along side Doll for her innocent yet beautiful features: her innocent doe eyes, her delicate slim figure, but the one thing that would catch anybody off guard are the wings that would appear on her small back. What happens when two mysterious people join the circus? Will Butterfly stay the innocent girl she is or will she loose her innocence to these mysterious men? Will Doll save her sweet butterfly before its to late? Doll x OC x Ciel Some parts of Book of Circus will be twisted like the circus wont be killed off and other things you'll need to find out yourself.