Black Butler: Book of Circus (aka Black Butler season 3)
Synopsis: "In Black Butler, Book of Circus, Ciel and the demon butler Sebastian are summoned by the Queen to investigate multiple reports of missing children. When their underworld contacts reveal the disappearances increase when the mysterious Noah’s Ark Circus comes to town the demonic duo must impress an enigmatic ringmaster in order to go undercover as performers-to Sebastian’s delight and Ciel’s disgust.
At the core of the circus is a troupe of unique performers from Dagger the knife thrower to Beast, the beautiful tiger tamer. All are connected by someone who changed their lives, someone who raised them from the gutters of London to the heights of the big top - but at a price."