Black Butler: Book of Circus

Black Butler: Book of Circus is a thrilling, dark fantasy anime series that straddles the line between neo-gothic horror and comedic relief – a fusion that gives the series its unique flavor. This 10-episode miniseries from FUNimation released in 2014 is the third installment in the Black Butler series and marks a return to the main narrative's chronology following the titular character's dealings with the underbelly of Victorian London's supernatural scene.

Set in the 19th-century English society, the show focuses on Ciel Phantomhive, the young head of the Phantomhive family who shoulders the responsibility for solving England's sordid mysteries, often pertaining to the swirling phenomena of the netherworld. Ciel is no ordinary 13-year-old noble. He is a beacon in England's murky world of crime and supernatural events, conducting investigations on behalf of the Queen. After his family is brutally murdered in a fire, Ciel sells his soul to a demon in exchange for help avenging his family's death. The demon takes on the guise of a butler named Sebastian Michaelis, bound by a pact to protect Ciel and fulfill his every demand until he achieves his retribution.

In Book of Circus, the Queen sends a letter to Ciel Phantomhive instructing him to investigate a traveling circus named Noah's Ark Circus. Children are mysteriously disappearing whenever the circus arrives in town, and it is up to Ciel and his devilish butler, Sebastian, to infiltrate the circus and unmask the evildoers. As they work undetected under the guise of performers, they navigate through a tightrope of danger and suspense that balances this new vibrant circus environment and the macabre reality of child abduction.

Their adventures expose them to a motley crew of vibrant performers, each with their unique abilities. These range from the boisterously energetic ringmaster, Joker, to fierce beast tamers and eccentric trapeze artists, adding a layer of intrigue and vivid color to the otherwise somber tones of the series. Alongside the primary narrative of mystery, Black Butler: Book of Circus offers a deeper exploration of our protagonists' characters and the complexities of their supernatural pact.

The stoic expression of the eye-patch clad Ciel Phantomhive sharply contrasts his tender age and contributes to his mysterious aura. Meanwhile, his butler, Sebastian, is the epitome of perfect servitude on the surface but houses a demonic hunger beneath his polite manners and flawless aesthetics. Audiences also get to see the comedic interplay between the house’s domestic staff, as well as the scrutinizing but lovable relationship between Ciel and Sebastian. Their complexly woven master-servant bond adds emotional depth to the storyline, with the recurring theme of pact and possession bound by the dichotomy of control and protection.

A key quotable from the series that encapsulates Sebastian's character is: "I'm simply one hell of a butler." By turns, it's a statement both ridiculous in its overt cheekiness yet grim when you understand its veiled truth. It humorously underscores the dark premise of the series while showcasing the show's particular brand of humor.

The captivating animation work in Black Butler: Book of Circus merits praise, with an exceptional portrayal of Victorian-era England, effectively capturing the country’s architectural grandeur and fashion. The circus setting provides a refreshing chance to incorporate vibrant and extravagant artistic hues that contrast with the customary darker tones of the series. This dynamic visual direction, coupled with a haunting and evocative soundtrack, accentuates the narrative's chilling twists and turns.

In short, Black Butler: Book of Circus is a riveting, beautifully animated continuation of the intriguing world of Black Butler. It combines an engrossing blend of mystery, macabre themes, and humor steered wonderfully by memorable characters. Whether you are an old fan of the franchise or a newcomer curious about the supernatural narrative and the unique setting, this series promises to engage you with an insightful exploration of a young noble's quest for revenge aided by his demonic butler. For those who enjoy a Victorian-era setting woven into a chilling supernatural plot with touches of humor, the series is sure to be an unforgettable ride.