Even though he coldly says, "I will not marry you," His Highness's kindness is obvious, isn't it? ~The Crown Princess Candidate is a Countess Who Can't Use Magic~

"I didn't come here for a marriage based on love—"
In the Kingdom of Lycion, where magic is highly valued, Elna, the daughter of a poor noble family, aims to become the Crown Princess. However, she has extremely little "mana," the core of magic, and is unable to use it. After immense effort, she becomes a candidate for Crown Princess, but is coldly rejected by the First Prince, Leonhardt. Nevertheless, for the sake of her family and the future of her people, she continues to fight with unwavering determination. Then, one day, after sensing a strange black "presence" in the royal palace, she learns that Leonhardt's life is in danger. There was a hidden reason behind his rejection—!!! A thrilling romance unfolds in the royal palace! What will become of Elna's fate—!?

https://www.cmoa.jp/title/335488/