Tokyo is definitely the place where English in Japan is most ubiquitous. In addition to bilingual signage in the Tokyo Metro, JR Lines and in popular areas like Asakusa and Shinjuku, a large percentage of people in Tokyo speak some English, even those who don't work in foreigner-facing professions.
How many speak English in Tokyo?
Yet despite this growth, studies estimate that less than 30 percent of Japanese speak English at any level at all. Less than 8 percent and possibly as little as 2 percent speak English fluently.
Can you survive in Japan with English?
It's certainly possible to work in Japan without speaking Japanese, though your options will be limited. The first choice by newcomers to Japan is typically teaching English at private English language schools, or eikaiwa.