Like everything else, Japan takes sake seriously, only more so. The belly-laugh inducing firewater has been produced in Japan continuously before history was even recorded in writing.
Often served warm, sake is Japan's national beverage and holds important cultural meaning. Sake is technically filtered rice wine and is between 15-20% ABV, depending on the brand.
Consuming sake in Japan is a must for any tourist seeking to connect with Japanese culture. Of course, you may not have to seek out this experience. It just might be forced upon you.