Kuroshitsuji: Book of Circus

Synopsis

It's night and Noah's Ark Circus is about to start their next show, but Ciel and Sebastian intend to look for clues in the first-string members tents while they are performing. However, Ciel is left alone when both Sebastian and William are summoned to replace the trapeze artists. In trouble because William refuses to cooperate with him, Sebastian is forced to improvise and return in a hurry before Ciel is caught by Beast, who returns to the tent to replace some damaged garments. After Sebastian returns to the stage, Ciel finds more clues including a letter to Joker where he himself is mentioned. Once leaving the tents, Ciel is saved from a snake by Doll, one of the main performers, and learns that she is in fact his roommate Freckles. After fabricating a story to dissuade her, Ciel has a crisis of Asthma and gets himself bedridden. While Ciel sends Sebastian to investigate further in the city based on their newfound info, Snake discovers that the duo is spying on them and informs Joker, who decides to not take any action before consulting with their leader.

(Source: Wikipedia)