Black Butler manga volume 6 features story and art by Yana Toboso.

The cheer of the holidays may have passed, but the Noah's Ark traveling circus has been making the rounds, bringing fun and joy to children of all ages. However, as the ringmaster's cries fade away, a disturbing trend begins to surface in the wake of the colourful entourage. Children are disappearing whenever the circus packs up for its next destination, and there are no clues - or corpses - to be found.

Dismayed by these occurrences, Queen Victoria dispatches Earl Phantomhive and his most able butler, Sebastian, to locate and reunite the missing children with their loved ones. When the situation calls for the pair to infiltrate the big top undercover, however, will Sebastian's inhuman skills be enough to see him and his young master through a treacherous tightrope act that may well end in death?