Shinjuu Kishi-sama no Senzoku Maid: Munou to Yobareta Reijou wa, Hontou wa Kishou na Seizokusei no Tsukaite datta you desu

Tilia was born into a noble family famous for their magic, but she was the only one among them without any magical power. Because of this, she was considered useless and treated as a servant in her own home. One day, gentle mythical creatures begin to approach her in mysterious ways, drawing the attention of a duke who suspects she might have a hidden gift. Over time, the two grow closer... This is the story of a mistreated girl who finally learns her own worth. (Source: Kodansha, translated)