A younger sister envies her older sister's golden hair and blue eyes, constantly calling her unfair. The older sister doesn't understand why she's called unfair. After the younger sister uses magic to steal her older sister's coloring and takes away her fiancé, the prince, the older sister decides to take revenge on her younger sister.

Elis, the daughter of a marquis, has a half-sister who always envied her golden hair and blue eyes, calling her unfair. However, the older sister would comfort her, saying "that can't be helped, your brown hair and eyes are also beautiful," praising her younger sister's appearance. Despite being treated coldly by her stepmother and father, Elis cherished her only younger sister. Two years after Elis became engaged to the crown prince, before the wedding ceremony could take place, her hair and eyes changed to brown. She was deemed a cursed woman, her engagement was broken, and she was sent back to her family home. There, she found her younger sister with golden hair and blue eyes, and her parents insisted that she had been born with this coloring... Cast out from her family home and hearing that her younger sister had become the crown prince's fiancée, the older sister decided to take revenge on her sister—but...