Do the Japanese drink whiskey?

Yes, they do. Japanese traditional drink is sake. That's rice wine, not whiskey. But they can get almost every kind of whiskey in Japan. Some kinds are more expensive than in the West, but it is available, and people do drink it. They have good Japanese whiskey too.

There are a lot of bars in Japan. They have all sorts of drinking places: Japanese -style, western-style, sometimes both together.

Is sake strong?

It's only about 16 percent alcohol, or 32 proof. But westerners seem to think it's much stronger than wine. They drink it hot and straight or chilled and straight, but some westerners like it on the rocks to dilute it.