Mujikaku Seijo wa Kyou mo Muishiki ni Chikara wo Tare Nagasu

The Oblivious Saint Can't Contain Her Power centers on Lady Carolina, the overlooked daughter of a powerful duke who has spent her life convinced that she will always live in the shadow of her distinguished father, the nation's prime minister, and her elder sister, a prodigious mage chosen to become the next Saint. With her place in the family seemingly fixed, Carolina settles into a quiet existence, only for a sudden royal decree to overturn everything and force her into a political marriage with the fearsome "Bloodthirsty Prince" of the neighboring Empire of Malcosias. As Carolina is drawn into court intrigue, danger, and fragile alliances, she must face the obligations of her new role while proving that she is more than the family member everyone dismissed. The pressure of duty collides with the possibility of true love, and the first stirrings of her own latent power begin to surface, hinting at a truth she has never dared to consider: that her worth, and her strength, may be greater than anyone realized.