You can absolutely get around Tokyo with only English, although it requires a bit of patience and the use of technology. Tokyo is one of the most tourist-friendly cities in the world. All major transit systems, including the Tokyo Metro and JR lines, have signs, maps, and ticket machines available in English. Major department stores, hotels, and popular restaurants in districts like Shibuya, Shinjuku, and Ginza usually have English-speaking staff or English menus. Even if a local doesn't speak fluent English, they are often extremely helpful and will use gestures or "pocket talker" devices to assist you. To make things easier, you should download Google Maps (which is incredibly accurate for Tokyo's complex train system) and Google Translate, which has a "Lens" feature that allows you to point your camera at Japanese text to see an instant English translation. While you won't be able to have deep philosophical conversations with everyone you meet, the infrastructure is designed so that English speakers can navigate, eat, and sightsee with very few major hurdles.