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The most popular drink in the Suwa area may possibly be this "Takaten Karakuchi".
It is a very popular sake in the Suwa area, and you can usually find two or three bottles of it missing from the shelves in every store you go to. It is moderately spicy and can be drunk with a small side dish, or as a mid-meal drink. It is also reasonably priced because it is a regular sake.
It may not be available outside of the local area, but I am sure such sake can be found all over the country!
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