I went to Daishichi Sake Brewery. Osaka-ya Shoten next door sold all kinds of sake, so I bought some. They are delicious. Sorry for the lack of writing skills in the review: ......
Delicious!
The sake is made using the traditional sake yeast, and has the calmness of old sake, but is still fruity and refreshing.
I don't usually drink old sake, but I was surprised at how good it tasted.