Now back to the discussion… Everything that follows here will be spoilers, so read on at your own risk :)

Even more curiously, he returned with Claude Faustus, an enigmatic, emotionless butler with unfathomable talent… Alois eventually returned home and became the head of his mansion, but seemed to exhibit some strange behavior ever since. Gradually, he lost his parents, his best friend, and everyone he knew. He was kidnapped as a baby, and was forced to work in a village as a slave. The sadistic yet cheerful Alois Trancy has faced some harsh times. In late-nineteenth century England, one year and three months after the dramatic conclusion of the original series, Kuroshitsuji II introduces a new butler and young master. As the Queen's guard dog and standing at the top of the British underworld, Ciel solves the crimes plaguing London while waiting for the day he will exact his revenge. Little do they know, Sebastian is actually a demon that has entered into a contract with Ciel, promising to help the boy achieve revenge on those who have wronged him in exchange for his soul. To others, it seems that the butler is simply the best at his craft, from anticipating his young master's needs to carrying them out to the best of his inexplicable abilities.

After a month of enduring excruciating and humiliating torture, Ciel returns to the Phantomhive household with an enigmatic black-clad butler, Sebastian Michaelis. On the night of his tenth birthday, a fire engulfed his manor, his parents were murdered, and he was captured by cultists. In Victorian-era London lives the young boy, Ciel Phantomhive.

Black butler season 2 sub