Occupying a mansion cloaked in secrecy, nobles and living dolls reside alongside each other. One such pair, Kate and Emilico, was deemed "of age" recently. But what awaits them in the children's building with their fellow Shadows is a delicately woven web of shifting alliances. Who can be trusted, who can be used, and who must they deceive? Their survival at Shadows House hangs in the balance.