There is an agreement betwixt certain beings..giant monsters destroy Japan, aliens destroy US, global warming destroys antarctica, extradimensional dungeons destroy korea, and zombies get everything else.
Too many bijins in Japan. Also the country is too homogeneous. The monsters want to add to variety to the population. Very good idea if you ask me
It's funny how the stupidest questions generate so much traffic This was a test, and you all passed with flying colors.
Mostly because we as authors tend to use what we consider our own preferences and experiences to create work. In this case, our own nations, since we can feel a personal interest and conflict when these places are "attacked" and the audience can also easily be connected with the scales of the story. Is why America always save the day, why all kingdom wars happen in China, why all dances happen in India, why iron man 3 needed a Chinese surgeon and why Japan is always attacked by the monster. All nations had this sense of national pride, to be honest.