This sake was purchased after reading the manga "Sake and Love Must Be Drunk". It is sweet and sour like a lactobacillus drink and easy to drink with low alcohol content of 6%. I think I'll try it frozen next time.
Sake store in Yokohama. The introduction of the sake said "Adult Calpis", so I ordered it. It is exactly the kind of strong acidic calpis. I could drink it in large gulps.