Red Dragon is a hostess club so there are no sexual services offered. There are ways to hook up with hostess and I'm sure there are people on the board here with stories about hostess clubs and how they spent huge sums wooing hostess x before nailing her.
I've been inside Red Dragon but unless your Japanese is flawless and you obviously have money (show up in Zegna suit, an Hermes tie, and John Lobb shoes), you aren't getting in as a foreigner - unless you have a connection. Even then it's hit or miss.
Plus, as with all hostess clubs, it's rip off of epic proportions. That said, a good look at Ruri Saijo's rack (even in a dress) is worth something.....