Yue Wuying is the princess of the Yue family, the only one who can be the heir at the age of 13; she is the fiancée of Hito Seiji.
Her name is Dark Night, and she is the third member of SHIPS.
Both men and women can become the heirs of the Yue family, but they must undergo training from an early age. No one except them knows how difficult this training is. But it is precisely because of this almost cruel method that the best heir to the Ye family can be selected. Usually, the Ye family has very few heirs, so each heir must have three fiancées (fiancées).