Not to rain on anyone's parade here, but consider your looks before going to place like that. Even if you go with someone like Manami, doesn't mean you'll automatically have a good time. You need to have your own appeal to attract other girls if that's what you want. Manami or any other attractive woman like her, would draw many guys but their partner (female) may be reluctant if the other partner is really unattractive.
All I'm saying is, don't bother wasting your money if you have a hard time pulling regular Japanese girls off the street. You'll also have to face other foreigners there from time-to-time as well.
That all said, would love to hear about someone's experiences at thee clubs either with or without a paid escort. (Note: the Japanese guys sometimes bring paid J-girls as well..)