I'd like to point out the flaws here.
12 year old teaching English in a foreign country. Yeah no. Can you say illegal? You'd need a teaching degree which requires college, also a signed contract with the school in question. No 12 year old has the legal power to do either of those things.
Your friends are there with you? They're teaching with you I'll assume you'll say. Sorry, schools wouldn't chose groups of friends to go to 'teach'. They would choose the most qualified people to get the job done if they were even legally allowed to do so.
Anime convention. Completely stereotypical. No more comment there.
I have a strong feeling that if someone were to trace your IP, it wouldn't be in Japan.
If you really want to prove you're in Japan. Get a picture taken at the dog statue in Shibuya holding a paper with your username on it.
I could understand that you might be there visiting, but to say you're teaching? No.
Again, logic my friends. It's a good thing.
Try again.