They are very popular in the US.
Now you know!
Japan has many wonderful Sake places called Izakaya ... Very friendly sake gathering. On the the best places to meet people.
The drinking age in Japan is 20. Just remember that.
Some of the places I go, a bowl of Ramen starts 350 yen ... many places sell their base ramen for 500 yen.
It is chain of Chinese Style Food restaurant famous for Gyoza dumplings.
There are many popular restaurant chains in Japan that are not servicing Japanese food. You should try Gyoza no Ohsho when you visit Japan.