There are free lance girls all around different areas however the pros here in Japan don't dress the part and most of them are Chinese girls some are worth it while most are not.
When will you be here in Tokyo?
I would say if this is your first visit you should try Paradise in Kawasaki one stop from Yokohama on the Jr line. 12000 yen is not a bad price to get some young Japanese girl to play with you for an hour at a Soapland. This place is called Paradise address: 210-0023 Kanagawa Kawasaki Ogawacho 11-4, Ogawacho Japan
Google map it and you'll find where to go. Also this place is very foreigner friendly so don't mess it up for the rest of us.