Kuroshitsuji: Book of Circus

Noah's Ark Circus arrives in London with dazzling performances, yet its route coincides with a growing number of missing children. Acting on Queen Victoria's orders, Ciel Phantomhive and his demon butler Sebastian Michaelis infiltrate the troupe as performers to uncover the connection between the circus and the disappearances.

The investigation forces them to balance their acts beneath the big top with covert searches behind it, while the other performers become increasingly suspicious of the newcomers. As Ciel draws closer to the mysterious patron supporting the circus, the case stops being merely royal business and begins cutting into his own past, with something far darker waiting beyond the stage lights.