I felt like the author imagined Marie Antoinette before the guillotine and then, imagined being able to go back 6 years in time, added a fictional character, a 12 year old foolish and spoiled princess of the Tearmoon Empire, and voilá you have a very entertaining and interesting story that could have been titled alternatively "The Virtue of Keeping your Head: (Step by Step guide/journal to avoid the Guillotine)."
This isekai-fantasy (travelled back in time to save your own neck) novel series is well written, organized and thought out. Some of the anectdotes thought out by the author are cute, others are kind of funny, and yet others are shameful, but in general it is an enjoyable atypical light novel series.
With powerful ethical lessons to learn and to be learned like the Golden Rule, what you sow you reap (cause and effect) and having a terminal/final date with the guillotine, Mia, the main character, for the first time in her life, works super hard to make everyone around her better, kinder, and happier. If her ulterior motive is keeping her head, so be it, greed to live, makes her the ideal stateswoman in an isekai-fantasy novel series.
I am sure, that most politicians around the world, if were forced to work well, by threatening them with the guillotine at the end of their election period, would begin to work, for the first time in their lives, for the benefit of their territories and not self-benefit/corruption. What the world needs urgently today is compliance from the bureaucrats, from the public officials, but especially from the politicians elected to public office, everywhere. If they entered a contract to do a good job, keep their word/remain honest or die!