A few observations from reading this thread so far...
Mikawa, if you're considering an internet dating service, have you asked yourself what it is that is stopping you from meeting girls at the moment? Are you getting out enough? Do you have any interests or pastimes that allow you to meet other people? Have you considered joining a club, or perhaps taking up a new sport, or similar in order to regularly meet people? The chances we get to spend quality time with new aquaintances are actually fairly limited from day to day. Sometimes you have to push yourself into new things to make those opportunities.
Reading between the lines of some of the stuff you said, it sounds like you're a little desperate for a girlfriend. The post you made a few back saying "maybe" you had a new girlfriend, which turned out not to work out, is pretty indicative of this. Most people know if they've started dating or not. They "maybes" are usually overly wishful thinking on the part of one or the other person who is hoping for something that isn't really there.
I'm not scoffing at you - it's a natural feeling to yearn after someone, especially if you've been single for a long time. But sometimes guys especially can become a little overkeen. In my experience, decent Japanese girls often look for friendship first (I'm not talking about the local any-gaijin-will-do-****** who hang out in your nearest expat bar), and take a little getting to know.
I actually met my wife through my job, long before I got to know her. In fact I don't even recall the first time I met her - something she reminds me about frequently to this day ;-) I've always believed that this is what eventually led to us getting married, because we got to know each other gradually, and didn't start dating from the first day we met. When my previous relationship ended, I went out with her a few times just socially, and we found that when we started spending a little time alone together something clicked.
If there is someone out there on the Internet who is right for you, then there is someone in your immediately vicinity who would be compatible too. Possibly even someone you already know. Anyone who believes the "one special person out there for everyone" bullshit, is misguided. There exists a certain percentage of people out there (more or less depending on your personality) who are compatible with you and you with them. It's just about being in the right place at the right time, when one of those people comes along. And the more places you put yourself, the more chance there is you'll be there.