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From the official website
This is the third in the Yamamoto series, following Pure Black and Midnight Blue.
The sake rice, milling ratio, and yeast used are the same as for Pure Black, with the only difference being the koji mold. The sweet and sour first kiss-like flavor is derived from citric acid, which is found in lemons and other citrus fruits.
It is only prepared when there is enough stock of Pure Black, so there is no fixed time for its release. You should buy it when you find it in stores."
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