Formerly, the Fallen Daughter of the Duke, Volume 1

Description

Claire Martino once had everything: a loving family, a crown prince fiancé, and a hopeful future using her family's inherited magic. Then, in an instant, she lost it all — and the culprit was her own beloved half-sister. As the daughter of the now-disgraced duke and scorned as a villainess, Claire leaves everything she knows and sets out on a journey to find her true self. 
But wait, isn't that the plot of the otome game NEW START ♡ ETERNAL LOVE on its hardest route…?

Saki Ichibu is a light novel author who has released several titles on the Japanese self-publishing site Shôsetsuka ni Narou, including Formerly, the Fallen Daughter of the Duke, and numerous other isekai stories. Creating the art to bring Ichibu's story to manga form is Ushio Shirotori, also known for Ayashi Kotogatari.

Empowering romance story where the protagonist takes her destiny into her own hands

Otome romance game titles are incredibly popular among young female readers

Isekai title where the lead character is actually a character in a video game being played by the true protagonist

Great follow up title for fans of I Was Reincarnated as the Villainess in an Otome Game but the Boys Love Me Anyway!, and Her Royal Highness Seems to be Angry