After learning about Japanese culture, you will sooner or later come across the term "Kyabakura" [キャバクラ] which refers to a bar that employs ladies to sit next to you who will light your cigarettes (if you smoke) and pour drinks for you - and if you don't drink then you cant get in as that's one of the main ways these establishment make their dosh.
"Kyabakura" is a compound word made up of "Cabaret" [キャバレー] and "Club" [クラブ]. Ladies that work at these establishments are called Kyabakura Jyo [キャバクラ嬢] which is often shortened to Kyaba Jyo [キャバ嬢] or Hosutesu [ホステス].
These clubs make their money in varying ways. The one in the poster above charges 3,800 yen for 40 mins where apparently you get to drink as much as you want. They charge 3,000 yen for every extra 20 mins you spend in the place and if there is a particular girl who you want to look after you then you pay an extra 3,000 yen. They also charge 15% tax when the national tax rate is only 5%.
Usually what happens is that one of the hostesses will accompany you at a table and chat with you. They usually make a commission depending on how much you drink - the more you drink, the merrier you and her purse will be. She will probably try to keep you in the bar beyond your initial 40 mins in this case where you will have to fork out more dosh - and again the merrier your hostesses purse will be.