ルーン魔術だけが取り柄の不憫令嬢、天才王子に溺愛される ～婚約者、仕事、成果もすべて姉に横取りされた地味な妹ですが、ある日突然立場が逆転しちゃいました～

A pitiful young lady whose only talent is rune magic, doted on by a genius prince ~She is a plain younger sister whose fiancé, job, and accomplishments were all taken over by her older sister, but one day, their positions suddenly reversed~