Can someone who speaks Japanese and knows Hetalia explain this video to me?

http://www.nicovideo.jp/watch/sm7835794 You have to get an account to watch I think, but can someone please tell a few things. For example: 1. Is that a real song? 2. What does it mean? 3. Is the song relevant to Hetalia somehow or is it just supposed to sound cool? 4. What's the story in this video? It... show more http://www.nicovideo.jp/watch/sm7835794
You have to get an account to watch I think, but can someone please tell a few things. For example:
1. Is that a real song?
2. What does it mean?
3. Is the song relevant to Hetalia somehow or is it just supposed to sound cool?
4. What's the story in this video? It looks really serious and dramatic but I don't get it.
Also any other details you think might be relevant would be appreciated...
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