Angelica works at a museum and is somewhat of a specialist in the Kingdom of San Paolo in Europe. One day, she is contacted by the king of the kingdom. According to tradition, he will soon retire, and since he has no children, they have found a distant relative who is next in line to take over the throne, Ramone. However, he is a hopeless slob who only thinks about baseball. Now, Angelica is given the task of training him for the role, teaching him the history of San Paolo, etiquette, and Spanish.
Unknown kingdoms in Europe (how many are there) and it rarely turns out well. This movie ends up being a poor pastiche and feels altogether ridiculous. It is about as infantile as the poster suggests.