@
GoldenDalton
I'm answering because the question was addressed to me.
It's about if you are willing to gamble or only want a guarantee. If you are willing to gamble on dating Japanese women for free, you might get a long term girlfriend or sex friend. If you want a 100% guarantee, you should pay. But then, she isn't your lady and she can be bought by others. It's a plus and minus scenario for both types.
In your situation, and if you were willing to gamble on free dates, you could try:
. Metropolis Classifieds
http://classifieds.metropolis.co.jp/category/personals/women-looking-for-men
. Japan Guide
http://www.japan-guide.com/local/
. Interpals
http://www.interpals.net/language/JA
. My Language Exchange
http://www.mylanguageexchange.com/pen-pals/Country/Japan.asp
. Pen-pal.net
http://www.penpal-net.info/
Tagged, OKCupid, JapanCupid, POF (Plenty of Fish), Craigslist (though outside of Tokyo works better), and there are lots more...
Any place where real Japanese women are putting up ads and are willing to meet. With Pen-pals/language exchange, 50% or more are looking for sex-friends and boyfriends. It's just that many Japanese women (honne and tatemae) are very sneaky about how they go about it. You can setup dates WEEKS and MONTHS in advance.
I'm just saying that you can try free AND pay. Nothing stopping you from dating a free chick from the Internet Saturday afternoon to see what she is about and pay a chick for Saturday night. It all depends on what you are comfortable with and willingness to try.
Also, PROs and sugar babies lurk around the free sites too. If you post an Ad, they may e-mail you or will be quick to respond to e-mail. What is good though is site rules stop spammers. If you get spam, you can report their account or block them, so scammers tend to stay away from such sites. It is more a direct man to woman exchange.
After you exchange personal e-mails, you can work out various arrangements. Your ads or e-mail can be slightly suggestive, that certain types of women will figure out you want to have sex, be sex-friends, or are willing to pay. But it is a bit "cloak and dagger" at some sites.