Boukun na Ane ni Suteraretara, Koushaku Kakka ni Hirowaremashita

In a time when families born with the ability to bestow magical powers were said to enjoy peace and prosperity. Nobles flocked to purchase expensive gems and items endowed with magical powers as jewelry and talismans. Jacqueline and Ellie were sisters born with the precious ability to bestow magical powers. Ellie was born with strong magical powers, but Jacqueline, the older sister, bullied her from a young age and dominated her like a tyrant, forcing her to endow herself with excessive magical powers, thereby building her fortune. One day, Ellie began to show signs of depletion, meaning her magical powers would never return. No longer of any use, Ellie was abandoned by her sister in a tattered state. Ellie was in the depths of despair, having lost all hope of living, when a duke named Irvine gently picked her up.

(Source: Shusuisha, translated)