黒執事 Xvii [Kuroshitsuji Xvii] by Yana Toboso

In this gripping installment of the series, the enigmatic and ever-dutiful butler, Sebastian Michaelis, continues to serve the young Earl Ciel Phantomhive with unwavering loyalty. As the duo delves deeper into the dark underbelly of Victorian society, they encounter a mysterious circus troupe harboring sinister secrets. With a blend of cunning strategy and supernatural prowess, they unravel a web of deception and danger, revealing the true nature of the performers and their connection to a series of gruesome murders. Amidst the chaos, Ciel's resolve is tested, and Sebastian's demonic origins come into play, challenging the boundaries of their master-servant relationship.