How I Married Into the Togo Clan

Most people in this world are blessed at birth and receive their "Calling" when they come of age. Those who never receive their gift are known as the "Cursed Ones." When Fumi Matsukata turns ten without receiving her Calling, she's about to be abandoned by her family. Instead, however, they decide to keep her around as their servant.

Fumi's younger brother, Itsuki, on the other hand, is born with a powerful Calling, which he uses to torment Fumi incessantly. One day, the Matsukatas receive a proposal of marriage from the prestigious Togo Clan, a long line of clairvoyants. They assumed that the clan's eldest daughter wished to marry their talented son. So how will they react when they find out that the heir Seiji wishes to come take Fumi for his own?! In a world where those without a divine gift are scorned, a girl who's been taught that she's worthless suddenly becomes the wife of a formidable heir. Now that she's escaped her horrible family's clutches, will she find happiness? Will she find love?

(Source: Manga Plaza)