I'm a Daughter that's Timid to the MAX, but I Still Agreed to a Bet with my Tactful Fiancée

I'm a Daughter that's Timid to the MAX, but I still Agreed to a Bet With my Tactful Fiancée is Reincarnation isekai manga.

A geology student in Japan ends up murdered by pure bad luck due to walking into a convenience store that's being robbed at knife point. She awakens in the Otome Game Love and Cookies as Pia Rockwell, the unseen and unnamed fiancee of one of the capture targets, Rufus Stan; the game never gave a face or name, just a silhouette. Disguising her past life memory as a prophetic dream, Pia gets Rufus to agree to a contract to help set her up as a geologist and look at for the heroine in the future.

Trivia

 * Pia never intended to go through with the engagement, fully expecting Rufus to dump her (at minimum). However, her purity of spirit endeared Pia to Rufus; whom she completely misunderstands due to not seeing him fully as a partner.
 * The Stan family has "ninjas" under their command for protecting them and their loved ones.
 * The cookies from the Otome game are actually a drug like substance that makes the eater confuse the addiction to attraction to the one who gave them the cookies.
 * Pia ends up earning a PhD for her geologist knowledge; getting to be a professor before even starting high school.