madamarr（まだまー
I bought it at a certain liquor store in Neo Saitama.
I had drunk this flavor somewhere before...I wondered what it was...and after a few days, I found out that it was...probably...Katsugen!
So, what is this "Katsugen"? I guess you may wonder, but it's a lactic acid bacteria beverage only available in Hokkaido. I used to drink it a lot when I was little.
It's like makgeolli with a dairy-like sourness... As the label on the back says, it's best served on the rocks.
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