All Japanese children (at least as far as I know) get English lessons in school, however speaking the language in real life is a bit more difficult (which is understandable). I’d learn some basic Japanese sentences (like ‘thank you’, ‘please’, ‘excuse me’, etc) and take a small dictionary to point to a word if you need to explain something (or one of those point-it guides).

In any case, it’s always polite to learn a minimal bit of the local language, after all you’re a visitor in their country. (and don’t worry about making mistakes, they’ll love you for trying anyway :) )