Kou Matsurika is pretty content with her modest rise in position from a low rank palace maid to a female official within the inner palace of the nation Hakurou. One day her boss asks her to take part in a practice marriage interview in place of a co-worker who got sick. During that fateful meeting, the wheels of fate will begin to turn...

On the verge of death, Queen Ophelia wished— "I want to know who killed me." Then, in accordance with an "ancient promise" given only to the owner of the crown, the Fairy King Leah brought her back to life for just ten days! “I died once, so this time I will do whatever I want.” Ophelia's husband, who tried to use her to seize power... her brother, who is unreliable and tends to be swayed by those around him... a knight of the Royal Guard who has fallen in love with her... the list of possible culprits is endless. Who killed the queen?! A royal mystery begins in the palace with a strong slap that will clear the Queen's name before her death! (Source: ComicWalker)

Leticia's father, the current king, is very wise and knew that both of his older sons have their own supporters, and that if either one became king, the other brother's supporters would rebel—throwing the country into a civil war. To prevent this, the king decided to announce that he will retire while he's still alive and make his daughter, the princess, his successor! However, the princess doesn't have any political allies. So she decides to gather a group of knights loyal to her and form her own "round table" before the day of her coronation. The only problem is all of the good knights who are strong and skillful and loyal have already been snatched up by her father and brothers for their own personal guards… Based on a light novel: [Bookwalker](https://bookwalker.jp/series/1058/list/).