Cultural note:
"Hostess clubs" are typically bars where people (mainly men) go and talk to "hostesses". There is an hourly fee on top of the drinks. The "hostesses" are women that work for the bar and are there to listen and talk to people that come in. The patrons are expected to pay for the "hostesses's" drinks. After a number of visits, if a hostess "likes" a patron, she will hint that she is free for dinner, at which point one can arrange a "date" and take her to a hotel after the meal, if a suitable monetary "gift" is presented.
The difference between a hostess club and a snack bar is the staff. In hostess clubs, the "hostesses" are Japanese. In snack bars, the "hostesses" are of any other nationality, typically Filipino, Chinese, Korean, etc. Most hostess clubs are reserved for the Japanese clientele, as they are the only ones that can possibly "understand" the rules.