They charge money. I recommend never paying for a dating website when the free ones are almost always better.
They con you into the account and then tell you that you cannot get or send messages without paying.
This site will never grow very big due to that fact.
Very poor business plan, If i do not say so myself.
Pros
None, as far as Ive seen.
Cons
Have to pay.
Prostitution in nearly legal in Japan.
Why give your money to a website that will probably not work anyways.