Framed for attempting to assassinate the crown prince, Countess Leticia was executed along with her entire household. When she wakes up, she has unexpectedly rewound to her 12-year-old self prior to her engagement. Memories of the “future” of her magic-toolmaker family dying to the guillotine. Memories of living as a woman in another world as an engineer in Japan. When she recalls these two memories, the magic-toolmaker girl decided. If she becomes engaged to the prince, she and her family will be headed on a path straight for destruction. King’s order or not, she’ll definitely resist getting engaged! For the sake of restoring her declining House and protecting her dear family, this returnee noblewoman will begin a magic revolution!