After Kokoro's parents died in a car accident, she remains the only successor of the Yukin family, and therefore all wealth also belongs to her. Being still young and inexperienced, her grandfather convinces her to choose the groom from the list of candidates. In addition to all this, Cocoro cannot see the faces of candidates, because after the accident her father she sees the faces of people like animals and cannot say who is who. It seems that she will have to choose, based on their actions (and perhaps on their hearts), which is quite difficult to do, considering that everyone has a suspicion that they had a good reason to plan an accident of their parents. Place all this in the Christmas atmosphere, and you will get a magic novel installed in the Holy Night on Christmas Eve.