Mizuki Miyahara was living her best life, working as a robotics engineer. Ever since she was a child, she had recurring dreams about a lady Leticia, who was falsely accused and executed. One day, she had the same dream as usual, and then she was killed in a traffic accident. She found herself reincarnated as a young Letitia, before her execution. In order to avoid the terrible fate from her dreams, she tries to make a new life. First of all, she must find a way to avoid an engagement with the crown prince, who may be the one behind the plot....... (Source: Hifumishobo, translated)

Falsely accused of attempting to assassinate her fiancé, the Crown Prince, Countess Leticia and her entire family were executed. She was then reborn in Japan, retaining the memories of her past ambition to become a mage-engineer, and achieved success as an engineer — but then she died in a traffic accident. And now… she's been sent back to her 12-year-old self, *before* the engagement!? There's no way she'll repeat the same mistakes. An engagement? Absolutely not! She'll use her skills to develop new magical artifacts to uncover the conspiracy and save her family! (Source: Hifumishobo, translated)