Young Ciel Phantomhive is known as "the Queen's Guard Dog," handling the numerous disturbing incidents that arise in Victorian England for Her Majesty. With the help of Sebastian Michaelis, his devoted butler who appears to possess inhuman capabilities, Ciel employs any means required to complete his tasks. Yet, does this black-clad butler hide more than what is visible? Ciel's history contains a hidden tragedy that shrouded him in constant gloom—during one of his darkest periods, he entered into a pact with Sebastian, a demon, trading his soul for revenge against those who harmed him. Currently, Sebastian is not only an exceptional butler but also the ideal servant to execute his master's commands, all while looking forward to the tasty feast he will ultimately consume from Ciel's soul. As the pair works to solve the mystery behind Ciel's series of bad luck, a connection develops between them that neither heaven nor hell can sever.