Your Blade And My Heart

Desiree was once the heiress to a powerful dynasty-the Tamashii. She was to become the next queen of the land of Soul-a land of higher beings. But her fate changed when her family was murdered in cold blood. At thirteen, it was a miracle she survived the tragedy. Everyone else thinks she's dead and her body was among the ashes of her parents.
Alexander is a half demon assassin who goes by the name of Blade. Just the thought of his presence is enough to shake a whole town. He's known for his skills and ability to attack undetected. One strike from his blade is enough to end a life and trap its soul in an eternity of hell.
Years showered down on her and she grew up to be a vengeful woman. She learned how to fight and how to survive. Ever since the day her aunt was falsely crowned, she knew what she had to do. For years, she had trained and mastered every skill just to set her plan into motion. On the day she turned eighteen, she did exactly that.
Fate brought them together in an old pub where her beauty stood out amongst the crowd. He was a devil in disguise, but she saw past that. She knew power when she sees it, and she had to have it. Her mother once told her to never strike a deal with the devil. But Desiree knew what she had to do. In exchange for his services, she grants him a wish-any wish of his choosing. But is it worth the risk?