すんすけ
I found and purchased it at a souvenir shop at Zenkoji Temple. After purchasing it, I spoke with the owner of a standing bar in front of Nagano Station that specializes in sake, and he said he was being ripped off. Please be careful everyone.
It wasn't that expensive, though, and it was very tasty, so I was totally satisfied and drank it up immediately.
It is refreshing yet fruity, slightly effervescent, and very easy to drink. I think I understand why it is so popular.
Japanese>English
ジーマ
I am not sure if it is the same place (but there is one souvenir store in Nakamise that sells a lot of sake), but I was kind of taken by it. If you are looking for Shinshu Kamerei, you could buy it at Aonuma Shoten near the prefectural office for a fixed price.
Japanese>English