Konyaku Haki no Sono Saki ni: Suterare Reijou, Oujisama ni Dekiai (Engi) sareru

Estelle Flozeth is the sister of a countryside earl, and her newfound ability to see others' emotions through their mana has brought her nothing but trouble! Her life drastically changes one day when her childhood friend and fiancé is swept away from her by the daughter of a capitalist. Heartbroken, Estelle attends a ball and winds up meeting Prince Arcrayne, a wicked man who soon finds out about her special power and decides he must have her for himself! To that end, he proposes to her and begins acting like a veritable Prince Charming, pretending he fell in love with her at first sight—a charade that might fool everyone else, but not Estelle and her perceptive powers. Yet in spite of everything, she gradually finds herself drawn to the prince... Will their make-believe love blossom into the real thing? Find out in this reluctant Cinderella story fraught with political intrigue!

(Source: J-Novel Club)