Very very good.
Everything about the flash is really great. You obviously have seen a lot of anime. At no point I thought I was watching a flash either. Very good work!
I'm serious, I am a pretty harsh critic here on newgrounds.
The only things that stop this from becoming a 10 are the voice acting, (the guy yelling wasn't yelling), and the fact that nothing really happened in it. That is only a downfall is because it's so short for such a good animation. I'd say instead of making them 5 min, combine two or three into one, and people won't even know it's a flash.