Dubbed 'Princess Drab' for her plain appearance, Seren, the duke's eldest daughter, decides to break off her engagement to Prince Helios after learning he prefers her beautiful sister. Determined to escape the marriage, she sets out to become a skilled magician with the help of a black cat gifted by Viol, the Ice Magicians' leader, who has a sweet tooth. With this unlikely partnership, Seren aims to dissolve her betrothal and secure her freedom through magical prowess.