[Sangetsu]

First, what nationality are you? Second, do you have any teaching experience?

If you want to teach English in Japan, you need to be a native speaker, or to have lived in an English speaking country for 12 consecutive years.

If you don't have a degree, you need 3 years verifiable teaching experience. To verify your experience you'll need to provide 3 years worth of payroll stubs, or tax records.

If you have the above 2 qualifications, then you can teach in Japan. But you'll have to come here to get a job. English schools in Japan which hire from overseas will always require that you have a 4 year or higher degree.

So, you'll need to save enough money to support yourself in Japan for at least 90 days, though you should bring enough to last 120 days or more. Once in Japan, you'll need to hunt the classifieds for schools looking for help and send your CV/resume to each. Pretty much all schools will say they require that you have a degree, but some will be desperate enough to hire you without one.

Be warned that some schools are desperate for a reason. There are schools here which treat teachers poorly, fail to pay overtime, insurance, etc. They also do things like fine you for being late, or when there are complaints from students.

You can teach in Japan without a degree, but it won't be easy, and the conditions might not be nice. On the other hand, there are many people who do teach here with no degree, and have done well.