[Polar]

The very least you can do is learn some basic words and phrases. Tokyo is quite accessible with zero Japanese I was surprised but if you think it's bilingual think again

However the whole time I was there English was spoken to me a grand total of three times, all the rest was Japanese.

Am I fluent ? Heck no not even close, but I knew hello, goodbye, excuse me, I'm sorry, numbers 1-10 and some other stuff which got me respectful nods and bows.

Again it's the very least you could do being a guest in another country.