I didn't know it was called Masuizumi...I thought it was Manjusen.
It had a good taste with a slight firing. I drank it a little while after opening the bottle, but it became milder and easier to drink.
Mizubasho is a standard image to drink when you go to Kusatsu. It was foaming well. The feeling that sake is carbonated as it is. It is easy to drink, but the drunkenness turns.