There is a kingdom called Vivid Kingdom. There, there are two princesses named Princess Kohane of the royal Azusawa family and Princess An of the royal Shiraishi family. The two princesses are best friends with each other.

The princesses are expected to marry two princes for each of them. The princes are Prince Akito of the royal Shinonome family and Prince Toya of the royal Aoyagi family. Princess Kohane is expected to marry Prince Toya, Princess An, on the other hand is expected to marry Prince Akito.

One day, the two princes were talking to each other. Prince Akito was leaning against the wall while Prince Toya was sitting on a bench. Little did they know, the two princesses, Princess Kohane and Princess An were walking by and were also talking.