Rize, who works at her family’s magic tool shop, was forced to make counterfeit magic tools that appeared to be created by her older sister. On top of that, her own parents work her to the bone and deny her meals if her chores aren’t completed on time. One day, when she collapsed due to overexertion, she was protected by Dior, the Duke of Ice, a famous genius magician. Dior praises Rize as a legendary magic tool master, and proposes a fake engagement to her in order to free her from the unfair treatment of her family.