Kuroshitsuji: Book of Circus

The anime version of the Kuroshitsuji's circus arc really looks perfect. The story has been beautifully told. There was neither any dull moment nor did it feel rushed. It was darker and more psychological than the season 1 itself. The ending will surely have some impact on you or could make you think a bit. Almost each supporting or antagonistic character feels complete. You will also end up exploring more about Ciel and Sebastian.

If you are either going to follow manga or watch season 1, this one is totally recommended.