Lets assume for a minute that:

I'm a freelance translator, who resides in Japan but works with translation
agencies in Turkey only.
I have an account in Citibank. My agencies in Turkey deposit my weekly
paycheck to my Citibank account and I withdraw the money in Japan. Although
I pay shit load of banking commission; I don't care. Money's comin', so no
problem.
So basically, 100% of my income is from Turkey. I am not working in Japan. I
live there with tourist visa, leave the country every three months and come
back.

Practically I am not in ihou taizai or do I? And the only tax I am subject
to is 5% zeikin, right?