As for English-speakers, it’s a matter of chance. In general, I’d say there are not that many, but we often see scatterings of Western faces (possible English-speakers, I suppose) and get fairly frequent e-mails from tourists or people in situations such as yours who want to take in a game.

As far as getting tickets and getting around the stadium, you could probably get through most of that by pointing to a seating chart. Many of the staff will speak at least very basic English and will certainly make an effort to be as helpful as they can.

Almost all of the signage in the stadium and the in-house announcements are in Japanese.