I'm not sure specifically as there could be many different stories within a 'my fair princess visual novel'. Generally, it might be about a princess and her adventures, perhaps her journey to find true love or her struggles in a royal court.
Since I don't have detailed information about this specific visual novel, the main character is likely to be the princess herself. There might also be a prince or a knight as important characters.
Well, 'My Fair Lady' is basically about Eliza Doolittle, who starts as a poor and uneducated girl. Professor Higgins takes it upon himself to teach her proper speech and etiquette, and along the way, there are lots of ups and downs and interesting developments in her character and relationships.
My Fair Lady is about a poor flower girl, Eliza Doolittle, who undergoes a transformation in speech and manners with the help of Professor Henry Higgins. It's a charming tale of class, language, and personal growth.
Typically, there is a transformation. It could be the female character evolving from a simple or unrefined state to a more sophisticated and alluring one. For example, in some novels, the heroine might learn proper etiquette and manners, which makes her more appealing to the male lead.