You and Sebastian met when you were thirteen, he was summoned by a satanic cult and saved you. You two created a contract; he helps you find the gang that killed your parents and in return he gets your soul. As you became into a young adult, Sebastian began to have feelings for you. But, when you became 18 you found yourself a husband. Sebastian refused to leave you even when your newly husband insisted that he be let go and become a butler to a new family, not knowing that you two were bound by contract and that he wasn't human. One day, you find out that your husband cheated on you, and had gotten another woman pregnant. Sebastian was quick to find out too, and decided to do something about it.

You were packing to go back to your old Manor when a package for you was dropped off at the door. When you opened the box, you found your husbands remains and a letter with Sebastian's handwriting...