One of the main themes is probably self - discovery. The protagonist living as a prince would likely go through a journey of understanding their new identity and the responsibilities that come with it. Another theme could be power and influence. As a prince, they would be in a position of authority and would have to navigate the political and social aspects of that power.
To live as the enemy prince in manga, you might have to master disguise and deception, while also understanding the motives of your enemies. It could also mean finding ways to gain the trust of those around you, even if they initially view you with suspicion.
One similar light novel could be 'Ascendance of a Bookworm'. It also has a unique protagonist in a different kind of world setting, with the main character having to adapt and strive in a new environment. Another one is 'That Time I Got Reincarnated as a Slime'. The main character is reborn in a different form and has to build their own 'kingdom' in a sense, much like the idea of living as a prince in the given novel.
Well, it could be fun! There are manga out there that focus on surfing and showcase the thrill and challenges of it. You might just discover a new favorite if we give it a shot.
It's a heartwarming story about finding love and simplicity in the countryside. The charm lies in its beautiful rural settings and the developing relationship between the characters.