"Shiryoujutsushi nado Kegarawashii" to Shokei sareta node, Mazoku ni Tenshin Itashimasu

In a world where magic determines one's place in society, Rachel Sheringham stands as the daughter of a powerful duke and betrothed to the crown prince. However, her rare dark attribute magic sets her apart from others, granting her abilities that many fear and misunderstand. As whispers and suspicion begin to surround her unusual talents, Rachel must navigate the treacherous waters of court politics and ancient prejudices while discovering the true nature of her mysterious powers. (Source: Takeshobo, translated)