The fog of the abyss is unclear, the conspiracy continues, and the little king has not stopped yet. After Ciel became a demon, his relationship with Sebastian went up and down. At this time, Charles met the Demon King in the Demon World, and he discovered that his parents had a very important relationship with the Demon King. After the princess of the demon world told him the secret of his past life, Ciel found out that he was the sacrifice that the demon king had been looking for for a long time and started another chess game. However, will the king's knights still be loyal this time? Will Ciel continue his glorious journey with eternal life or become a puppet of the sacrifice?