Seirei Mahou ga Tsukaenai Munou da to Kon'yaku Haki Sareta node, Gimai no Dorei ni Naru Yori Tsuihou o Erabimashita

Eva, eldest daughter of the Crozik Ducal House, is treated as worthless for being born without spirit magic. Orphaned at a young age and used as little more than a servant, Eva's fate worsens when her fiancé—the crown prince—has an affair with her stepsister. Framed and forced to choose between exile or servitude to her cruel sister, Eva chooses freedom. With loyal retainers at her side, she sets out for the neighboring kingdom of Foresty, determined to start a new life!

(Source: Shueisha, translated)