Giseijo to Shiitagerareta Koushaku Reijou wa Nidome no Jinsei wa Fukushuu no Ikiru

Duchess Richelle is made the betrothed of the arrogant Prince Galusha by the oracle of the saint. However, she is unable to use her saintly powers for any length of time, and when the Countess Maria suddenly appears and displays her saintly powers, she steals Galusha's heart as well. However, her engagement to Richelle is not broken, and she begins to be tormented by the two. Finally, Richelle is beheaded for a crime she did not commit and ends her life at the age of 18, but to her surprise, she has regressed back to 10!　And since Galusha was still a selfish tyrant, Richelle vowed to take revenge in this life. First, she set out to find her friends, but !?　A smart merchant, an escort knight, and the head of an assassin's guild attacked the available pawns one after another!　But it's not going to work out that way!