Drinking with friends = 4000 yen ($43.01 €32.00) for 2 hours
If you are over 20, you can drink alcohol at a Japanese style pub. It costs 4000 yen ($43.01 €32.00) with two hours unlimited drinks (= free refills).
The above is an ad of a pub. That pub serves 8 dishes and 2 hours unlimited drinks with 4200 yen charge.
If you want to know something, ask me please.
