The Cursed Princess and the Lucky Knight

After mysterious deaths and misfortune ravages her family and leaves plucky Duchess Sonia de Clare orphaned in the Royal Abbey, Sonia is forced to take matters into her own hands when the king orders her into an arranged marriage to fulfill her duty as the surviving heiress to the massive Clare fortune.
Fully prepared to marry the dashing prince of the kingdom and retake her home, Sonia is only met with disappointment when she discovers who her mysterious groom to be is.
But when her own castle turns against her in a series of horrifying supernatural phenomena, Sonia quickly discovers the noble knight Sir Cristford Cortot is far more capable of protecting his cursed princess than any foppish prince ever could!

[From Cross Infinite World]