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There's a lot about Japanese culture I don't understand -- the hyperviolent, hypersexual comic books, for example. However, I do understand that Japan's population trends (http://news.bbc.co.uk/2/hi/asia-pacific/5132024.stm) are just a tad bit different from ours.
I don't ever expect Traister to think outside her microscopic box, and she didn't fail to disappoint in this case.