Yowaki Max Reijou nanoni, Ratsuwan Konyakusha-sama no Kake ni Notte Shimatta

Pia is an ordinary grad student who gets reincarnated as a 10-year-old background villainess in an otome game. She remembers the game ends with her engagement to the prime minister's son, Rufus Stan, called off, and her banishment from the land, so she asks Rufus to break the engagement now, while they are young. But her request only piqued Rufus' interest in her further, and he made a bet with her to see if he would really call off their engagement in seven years. (from manga) (Source: ANN)