To show a contract was formed, the demon places a contract symbol referred to as the Faustian contract symbol on Ciel's right eye, giving it a purple hue, and his iris and pupil now showcase the symbol of the covenant. One night, during a sacrificial ceremony to summon a demon, instead of forming a contract with the cult members, the demon states that he was summoned by Ciel, therefore he only agrees to form a contract with him, killing all the cultist members in the process. Ciel was also heat branded with a mark referred to as the 'mark of the beast'.

Ciel then endures endless physical, mental and sexual abuse at the hands of his captors. The same night he is kidnapped by the attackers and then sold into slavery, where he ends up in the hands of a sadistic, demon-worshipping cult. Ciel, amidst the chaos, discovers his parents, Vincent and Rachel Phantomhive, to be dead along with the family dog, Sebastian.

In Victorian-era London lives a thirteen-year-old earl named Ciel Phantomhive, who acquired this position after the events of Decem(Ciel's 10th birthday), when the Phantomhive manor was attacked by unidentified perpetrators and was set ablaze.

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