After her supposed death, a young woman returns as the son of her noble family to precede the family's prestigious company, with a demon at her side to avenge her parent's murder.

This story is about a young 13 year old boy named Ciel Phantomhive. Ever since his father and mother was killed in a fire, he was going into darkness being used for a ritual, unroll he summons a demon, as they made a contact which was if Ciel gets his revenge then the demon shall have his soul. What adventures wait them? You must see for your self. Sebastian never lies.

Set in the year 2020, Shiori Genpo (Ayame Goriki) runs the large corporation Funtom. Shiori is also a descendant is a descendant of prestigious noble family Phantomhive of England. As a descendant of the noble family Phantomhive, Shiori solves difficult cases which are ordered by the queen. In order to take revenge, Shiori makes a deal with Butler Sebastian (Hiro Mizushima). Their deal involves Butler Sebastian protecting Ciel until her revenge is fulfilled and then Sebastian will consume Shiori's spirit.—AsianWiki