Koshino-Kanmei Kasuwa Junmai-Ginjo.

There are few people who do not know about Koshino Kanmei. However, around 30 years ago, it became a premium sake, with prices skyrocketing and only bottles of Kanmei.
When you drink the original Kanmei again, it is easy to see that they have kept the old sake and cherished the tradition, but the times have not kept up with the light ginjo sake of today, such as Ottersai. Ishimoto Shuzo has therefore created a new line of light sake products, including Kawafusa.
It was also selected as one of this year's Niigata Sake Certificate Gold Masters of sake tasting.
If we were to describe it in terms of an examination, the color is clear and colorless, the aroma has a good aroma of alcohol on the palate, but after some time at room temperature, it is almost scentless, and the taste is neither spicy, sweet, nor sour, giving the impression of being "plain". When it is at room temperature and tasted well, the bitterness is strongly felt first, but then there is a slightly sour taste. However, after that, the slightly sour taste disappears quickly.
It is quite a good question for an exam question, but it is difficult to express.