Born into a noble family, Egami Yura refused to obey her father’s wish for her to marry an aristocrat. Instead, she becomes a lady-in-waiting at the palace in order to find her missing older sister. One day, Yura is saved from a drunkard by a young nobleman, Takamine Nagare. But it turned out that Nagare is really a spy digging for dirt on the aristocracy to sell...! When she learns this, Yura makes a deal with Nagare - she will cooperate with him, and in exchange, he must help her search for her missing sister... A mysterious romance blooms in high society!