How the Useless Me Became the Beloved of the Devilish Knighted Duke

Raised in a mistreated family, Elma is rescued, albeit somewhat forcibly, by the bewitching knight, Eugreek. She finds her true family and is doted on by Eugreek, and happy days seem to be about to begin. However, her cousin refuses to accept Elma as family and is openly hostile! Meanwhile, her other cousin inexplicably asks Elma to dance at the ball... and the possessive Eugreek is consumed with jealousy!! Furthermore, Elma finally gets her first job of "restoring a divine protection"! However, the item she's been asked to handle seems to have some kind of secret—!?

(Source: Futabasha, translated)