This isn’t a bar, but who cares when you can get 30mL thimbles of regionally brewed sake or shōchū for as little as ¥100 a shot? There are dozens from which to choose (and tasting sets of three glasses from ¥300 to ¥500 for those who can't make up their minds). It's an ideal place to get better acquainted with sake.
It’s on the ground floor at the back of the Japan Sake Brewers Association Building (日本酒造会館).