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She was cold and indifferent by nature. In order to take revenge and to find out who was behind the murder of her parents, she did not hesitate to sign a contract with the devil, allowing her to use the power of the devil to her advantage. He is a demon who has been sleeping for hundreds of years. Once because he was too bored, he signed a contract with a child. He thought it was just a sudden accident in his endless life, but he did not expect that he would have another idea as they slowly got along with him. (This article is about a normal love between a man and a woman. The heroine needs to dress up as a man because of the plot. I particularly don't like the main heroine, Mary Sue, silly and sweet plots, so except for the male and female protagonists, there are no infatuated second or third male characters.) (In addition, this article is inspired by anime. Any similarity in writing is purely coincidental, but 85% of the content is made up by the individual, especially the plot after the 80th chapter, which is basically a personal idea, but in life, there are so many random things, it is inevitable that they will be similar to certain incidents, but I will never plagiarize.)