What you need to know before your trip to Japan
Of course it would be VERY helpful to speak at least a bit of Japanese. My huge mistake was to rely on globalization and thinking that at least someone would speak English... NOT! Japanese are perfectionist and if they don't believe that they don't speak any foreign language to perfection they will always tell you they don't speak whatever language you're trying to communicate in.
2. Plug Adapter
Plugs and voltage is the same as in USA and Mexico, so no need for special adapters for your various electronics, specially since phone and camera chargers already have a voltage adapter.