If you would like to taste some of Japanese alcohol drinks such as sake, or select sake for gift, Imadeya is a liquor store that I highly recommend in Tokyo.
The stores are located in Ginza Six, and Kinshicho PARCO.
Both locations are near subway or JR station and very convenient.
Especially, Kinshicho branch has a wide drinking space, called "Kakuuchi."
Kaku means "corner," actually the corner of Masu, which is a Japanese Sake measuring container made from wood.
↑in my house
Uchi means "hit" in Japanese, and "drink" figuratively.
We can enjoy various kinds of alcohol drinks and some appetizers in reasonable prices at a tasting booth.
Even rare sake, Nihonshu which is hard to get in Tokyo, you can easily purchase in Imadeya.
Moreover, shop clerks are very friendly, and they know well about breweries. 
Yesterday, I tried Koshikibu Japanese wine from Kyoto.
It was light taste, but I heard that was the owner's idea.
Because he had been seeking for a new type of wine which suits Japanese cuisine.
Japanese wine is still developing now but I hope that Japanese wine will be acknowledged in the world, same as Yamazaki and Hibiki whisky.
Imadeya website in English
Ginza Six
https://ginza6.tokyo/welcome-to-gsix
Kinshicho PARCO
