Summer sake "Natsurei" from Raifuku, a local brewery in Ibaraki. Unlike Senkou's Beetle, it is not gassy, but it is quite refreshing and can be drunk in a gulp even if you are suffering from summer fatigue 🍶.
I tried it and I agree with the concept of low alcohol and easy to drink for beginners at any time, the taste is very sour and could be improved a little more.