Gimai ga Seijo dakara to Konyakuhaki Saremashita ga, Watashi wa Yousei no Itoshigo desu義妹が聖女だからと婚約破棄されましたが、私は妖精の愛し子です; My Engagement Was Broken Because My Half Sister Is a Holy Woman, but I'm the Fairies' Beloved Child

Margaret Silver, the daughter of the Duke, could see fairies from an early age. But that was a secret between her and her deceased mother. Until one day, she met someone who saw Margaret for who she really was, not as the fairies beloved child. --- [Original Web Novel](https://ncode.syosetu.com/n7311ge/)