There's actually a lot of people that know some English there, and if they don't know it then they frequently use hand signs or gestures to convey to tourists like you what they mean

I was surprised when I travelled, but it makes sense considering America's massive influence on Japanese culture. It shows when you see places like MOS Burger (like American fast food but Japanese-made, has things like sweet potato milkshakes and shrimp burgers. Super good and cheap btw!) or things like Disney in every toy store