I have no idea how my wife managed to find this rather unknown restaurant. Anyway, she recommended this to me so I decided to try it out together with three colleagues (four guinea pigs in total).
The restaurant was pretty empty at the time, perhaps since it's relatively new and did not promote themselves much or at all. To my utter dismay, none of my colleagues were able to drink alcohol at the time.
It was a pity because they had a pretty good selection of sochu and sake.