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Lu's bodyguard and butler.

As a child, Ciel's parents had been killed by bandits, leaving him to live in the streets. With the will to do anything to survive, this determination allowed Ciel to eventually earn his place as a famous assassin in the criminal underworld. After Lu had escaped from the Demon world by using the rest of her power, Ciel finds an injured girl lying unconscious on the ground. She had lost all of her memories except for her name, Lu. Ciel nurses her back to health and takes care of her, as she reminded him of his past. One night, demon assassins that were looking for Lu attacked.

Being no match against the high ranking demons, Ciel is killed protecting Lu. Regaining her memories and noticing his desire to live in his dying breaths, Lu forges a contract with Ciel where he must become her servant. Out of gratitude for saving his life and wanting Lu to be happy, Ciel gladly accepts and revives as a half-demon. He aligns his cause with Lu's and travels with her until her goals are completed. 

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