In the Black Butler anime ,a pampered young child, Ciel Phantomhive grew up in the wealthy noble family of Phantomhive. Diagnosed with asthma from a young age, he was somewhat frail and spoiled, but still attended the occasional get-together and meeting with his father, Vincent Phantomhive. A cheerful kid, he had a friend in his cousin and destined fiancee Elizabeth and they played together in the manor with frequency and grew close.
His tenth birthday approached, and his parents were murdered the same day- the manor set ablaze in a magnificent wildfire. Ciel was captured and tortured under the hands of his captives and branded with a damning and painful insignia. Calling out for God to save him and the other children captured there, his bitterness grew and he retracted his faith; instead crying out for anyone to save him from the endless torture and humiliation he suffered through.
Amassed in wounds and bleeding, a demon answered him and desperate to escape, he exchanged his soul for pledged revenge. Ciel and the demon he named ‘Sebastian’ forged a contract then- under the conditions that Sebastian would act as his power and protect him until his revenge on those that made him suffer was complete. Rescued and bitter, Ciel then ordered the reconstruction of his family’s manor and stepped up to become the Earl of Phantomhive as he made Sebastian his loyal butler.
Taking up the role of his father, Ciel answers to the Queen- Victoria, and using influence or whatever necessary means, takes care of Her Majesty’s ailments; oftentimes work in the Underground society in which secrets and the darker side of the country cannot be exposed publicly and must remain concealed and highly confidential.