The flavor was like that of peculiar natto (fermented soybeans), but when I drank it, I found that it was not that peculiar, but had a soft acidity and umami flavor, and was much easier to drink and tastier than I had imagined.
It was a honjozo sake, and it was described as "intense dry" so I thought it might be quite dry. I started drinking it thinking that it would be quite dry, but it was much milder and easier to drink than I had imagined. It had a very pleasant taste.