Akuyaku Reijou (Kari) no Funtou: Isekai Tensei ni Kizuita node Konyaku Haki shite Tamashii no Tsugai wo Sagashimasu

The Moon Princess, Lady Rebecca Howard, has recalled the memories of her past life on the night before her graduation ceremony. It seems that this is the world of an "otome game" with the Saintess Candidate, Miss Charlotte Silva, as the protagonist.

Charlotte is aiming for the fiance of the second prince who is... mine? So I, Rebecca, have the villainess role? After remembering my past life's beloved husband, this engagement is impossible!

Rebecca Howard, 17 years old (soul's age 60). I'll crush the 'Conviction Event' with "karma reversal," then move to the countryside after breaking off my engagement!

Reincarnated in an "otome game" world, this is a middle-aged woman's search for her soulmate that starts from a "Conviction Event!"

(Source: Kadokawa, translated)