The mesmerizing Noah's Arc Circus enchants audiences with its spectacular performances, yet a dark shadow looms over London as children vanish coinciding with the troupe's travels. Concerned by the disappearances, Queen Victoria enlists the aid of Ciel Phantomhive, her loyal guard dog, and his demon butler, Sebastian Michaelis, to delve into the unsettling mystery undercover. Juggling their circus duties with the secret investigation proves to be a daunting task as suspicions arise among their fellow performers and the enigmatic patron of the circus casts a sinister presence. As they uncover the truth beneath the big top, Ciel's world is about to be rocked to its core.