My sister took everything from me. Then, this time, I will take everything from you... and with this "power" I gained.

Despite being the daughter of a duke, Karin lives a lonely life, hiding the scars on her face behind a mask. Persecuted by her older sister Rihilda, who is seen as an angel in the world, she is sold to a brothel...the freedom to live as a normal woman, the home to return to, and the maid who was her only ally. The devil whispers to Karin, who feels despair that Rihilda has taken everything away

"I will give you the power to take revenge on the wicked**

Using the mirror given to her by the devil, Karlene transforms into the beautiful young lady Belle, and vows revenge on Rehilda.