[tommasi]

Don't come to Japan without a working visa. Very bad idea and you will suffer as you have to let go great opportunities just because you don't have a visa.

You may not know this, but the biggest English school in Japan, Nova, went out of business not so long ago and simply there are more people wanting teach in Japan than the rest of school can take.

So even you come to Japan, there would be very little chance that you get a teaching job right now because most English schools recruit teachers overseas. Many schools have offices in London so I suggest you to check them out and see if they have any positions for you.

If English is not your first language, then you should forget about big schools cos they won't hire you most likely. Try places like Gabba if you just want to come to Japan with a working visa. But you would soon find out that you can't make enough money to survive in Japan. Many gaijin bars hire foreigners as bartenders so it is risky but you could do that.

Anyways, secure your job first and then come to Japan. You could always come to Japan for 3 months and leave. 3 months is long enough to enjoy Japan without going through drama if you have money.

Good luck!!