What is the main story of Roman holiday?

The story tells a romantic story between a princess of a European principality and an American journalist in Rome, Italy, in one day.

Princess Anne, who was tired of royal life, went on a private trip when she visited Rome, and met Joe, an American journalist. Joe colluded with photographer Erbin to sneak shots of many wonderful scenes of the princess, preparing for a special report. Unexpectedly, I fell in love with the princess. In order to protect the image of the princess, I was able to reluctantly abandon the opportunity of success and send photos to the princess as a souvenir. Princess Anne didn't want to be at the mercy of the royal etiquette, but after a one-day holiday in Rome, she experienced her responsibility to the country, reluctantly abandoned her love and returned to the embassy, and decisively expressed her thoughts.