OK. Just don't hurry too much about going to Japan.
I have no choice so I have to go back to Japan, but I don't agree nor do I disagree with what my parents are making me do.
I hope you understand that in no way am I discouraging you from pursuing a career in Japan, but am trying to make you aware of issues you may not have noticed before. The English teaching Universities in Japan are mostly very mediocre academically, and although major Universities offer some degrees in English for the sake of foreigners and Japanese who are preparing for overseas work, the courses which are offered are Arts-type courses. I am under the impression that you seek more than what such a course has to offer. Also, you will have to pay a huge amount of money which is not government refundable (in your country, or Japan) for your University education in Japan, and you'll probably end up living on campus (which is not the most desirable place to live). Keep in mind that although you may have a good grasp on Japanese learned at high school level, you will find it hard living as a student in Japan, because in most cases people won't have time to explain everything slowly and clearly to you, and you will find it hard to keep up. I had the same problem in Australia, but listening to English, I imagine, is much easier than listening to Japanese. Also, at the moment Japan's economy is not the greatest, and you may end up with a degree which is only valid in Japan and as we know, Japan is cutting back many jobs and foreigners are finding it increasingly more difficult to find work in Japan and therefore many are moving back to USA / UK etc...
Many Japanese find it much more desirable to live in Australia, and understandably so. However, if you are to achieve this goal of yours, I suggest that you make some large considerations before putting your eggs in one basket and setting off to live the rest of your life as a foreigner in Japan. It will be extremely difficult.
It's different for me as I went to a good school in Osaka and my father is a very wealthy man who can 'pull a few strings' for me. However I also possess Japanese citizenship, residency so won't be difficult for me. Maybe only cultural re-adaption will be tricky!
But this brings me to one other thing -> At the moment it is hard to get STUDENT / WORK VISA in Japan, especially for Australians. However if you are New Zealander I believe there are special benefits.