Lucy's life at seventeen was already rough enough, but some how livable up until the day the incident happened and she lost practically everything. Being forced to sit and watch her loved ones murder and tortured endlessly for three days straight.Until she manages to summon a great demon, making a contract with the one and only Sebastian Michaelis for revenge in exchange for her mortal soul.
Working with the smug and sarcastic demon, Lucy works hard to hunt down her family's murderer and kill him herself. Then when things start to go as planned, Sebastian finds out the truth about his new found mistress; she's not completely human. With this information Sebastian determines that Lucy's soul is more valuable than he first thought and grows a little too close to his new mistress...