Hilde was once the eldest prince of a neighboring kingdom, but that all ended when his father lost the war. Now he's merely a hostage in the kingdom, a companion to the prince.
Not only the nobles, but even painters and servants can bully him as they please.
The only person who's kind to him is the prince, his beloved Casatino.
Hilde watches, wide-eyed, as his only friend walks with the princess, then runs away in sorrow...
But the prince chases after him and says that childhood friends are the ones who become spouses!
Theme: Love can cross any divide.