Even if called a villain, for the sake of the path I seek―― the "impostor noblewoman" will show you how to take everything! A girl named Claire, raised by pirates, challenges the captain's exam of the pirate crew. She finds her way blocked by a beautiful and cold man, Adolf, who is a heroic knight renowned in the kingdom. Captured by Adolf and facing a life-and-death crisis, Claire realizes it is all part of a plot by her adoptive father, who was a minister to the princess. To save her own life and that of her companions, Claire takes on a certain mission, which grants her the false status of "Countess" to investigate the secret of a certain incident. Even if her true identity is discovered or she fails, her life is forfeit, and to keep an eye on the "villainess" Claire is none other than Adolf himself. In a precarious situation, Claire and Adolf end up pretending to be "fake lovers" for the sake of their mission, but as they have led completely opposite lives, they clash repeatedly. However, through Claire's courage and quick thinking, and Adolf's clumsy kindness, they gradually begin to understand each other's beliefs and grow closer...