For those who don't know this series, it's a World War story that takes place in a universe where countries of the world are replaced by anime characters. For example "America" is a guy who's energetic, strong, and has hillarious ideas about how to fix things. While "Germany" is a character who is very serious, loves beer, and is strict about following the rules.
This series gives a satirical way of looking at countries and their relationships, it gives reference to many obscure things that happened during the Wars. This isn't a good series for people who takes things too seriously.
Edit:
Ah I don't watch the anime (I read the manga) but here is a sub version I found at Veoh. It's only 5 min long, enjoy~