You're the child of Ciel Phantomhive, and you live with him and his demon butler Sebastian Michaelis, and your mother passed away from giving birth to you, and you all live in the Phantomhive manor with a garder(Finnian), maid(Mey-Rin), cook(Baldroy). You were born with a special mark on the right side of your lower chest. Ciel is the queen's guard dog. He goes on dangerous missions basically every week with Sebastian.