After vanishing without a trace as a child, Y/N L/N returns to London years later, a shadow of the joyful boy he once was. Cold, emotionless, and driven by a singular desire for FREEDOM, he arrives at the Phantomhive manor with a mysterious agenda and a chilling connection to the devil himself. As Ciel and Sebastian struggle to unravel the truth behind Y/N's disappearance and the dark power he now wields, the line between ally and enemy blurs-and the price of freedom becomes more deadly than ever.