Mikawa, there's another site here
First of all I couldn't find out are you searching for some kind of proffesional online dating services,
but anyway I'm giving you one international date site, which is absolutely free indeed and is at a good level in my opinion.
What I mean by absolutely free is that not only the registration is free, but instant messaging too.
the site is linked here:
www.sladurana.com
You can give it a try.
I have registration there too.
I'd like to share with you I've been searching for common japanese dating sites - but I couldn't find any free. As far as I knew only the registration was free, after that you have to pay if you want to write to someone.
If I'm on a right way and I understand correctly what you are searching for - I can share some experience of mine about dating sites.
Please mind that the way people are acting in these site is dependent from their nationality.
In my opinion these sites are better to use from the people to 20-23 years of age. B'cos they are young and still don't have very clear opinion what they are looking for - and for them it is not a problem to meet someone for the party .
But when it comes to serious intentions becomes a little harder to find a person with the same intentions. most of the people are there just for chat in the free time they have when they are at work, or at home.
Personally for me, I'm chatting may be for 7 years or even more and in the beginning I had some dates with boys I had met in the virtual space

but now almost nothing can make me go out with a man from the dating sites....
I don't know , may be I'm getting old...

Regards, Ashanti