It's insanely good. It is in the same family as Roseyuki, but the water is different, and you can drink it forever. The alcohol content is low and just right.
It is said to be a concept worker series, but the contents are the usual Hiraizumi. It was sour and delicious. Despite the illustration, it was a solid drink.
It tasted as good as the label on the back, but I can't really tell the difference between it and Kabutomushi. If I buy it once, I'll just use regular Kabutomushi for the rest.
I think it was more fizzy than the usual cat spa. Later, it may have been a physical condition issue, but I was getting drunk faster. In any case, it was delicious.