I don't recommend to drink tap water in Japan.. They might say it's okay, but not really safe.

Wow great tips, thank you.

Usually from early June to late July. Hate the humidity!

Wow I never heard about it, but looks amazing. Thank you for the recommendation.

I have been there for several times, it's amazing.

In Japan it's still not easy to find places like that, but there is more and more every year.