She Is Wearing a Mask

As Count Cayenne's successor, Brilia lived as commander of the ranger unit. She is saddened when she hears the news that her younger sister Evelyn has died. However, for a short time, she decides to assume the identity of her younger sister Evelyn, to find out what has been hidden behind the scenes. Is it over there meets the prince of an enemy country, Schaffen, then he finds out that she is Brilia, and strangely he begins to actively help her after that. Also, even Crown Prince Louis, begins to help her...