I'm a librarian who loves anime, manga, and reading a wide variety of genres.
I think this is the start of the Circus Arc.
Toboso's art is pretty, and I enjoyed the humor in this volume. Sebastian, charmed by a tiger! Sebastian and William T. Spears, forced to be roomies!
Out of Sebastian and Ciel, only Sebastian has the natural ability necessary to become a member of the circus. However, since Ciel needs to join as well, Sebastian gives him a little bit of help...which is bit suspicious when Ciel turns out to be nowhere near as good later on. And then there's the whole issue of trying to adjust to rougher circus life. Ciel isn't really cut out for pretending to be a commoner.
I enjoy the little “if Black Butler characters starred in other types of manga” extra that's on the inside back cover of every volume. This one has Black Golfer.
(Original review posted on A Library Girl's Familiar Diversions.)