As many people know, Japan and Korea don't have the best relations. There are several reasons but the main would be the still not healed wounds left by Japan's occupation of Korea. This has left Japan to be extremely competitive with Korea. Personally I think they are both great countries with interesting cultures. I actually like Korean food more than Japanese food too.
This town has very few foreigners so have any sort of exposure to other cultures is great. A lot of racism gets passed from parent to children and you will hear young kids saying things like "I hate Chinese people" and have no real grasp of how horrible a thing they are saying. I think that being as island nation has put Japan into a dream like state where other nationalities are like fictional characters that they can speak badly about without any sort of retribution. I think that having one student, even though she was born in Japan, with a more diverse background will be great for these kids and give them a reality check that people are people.