Originally Posted by jphripjah

I wrote a review of all the NPB stadiums (with beer girl photos!) , it's here:

jphripjah reviews Japanese baseball stadiums

I highly recommend Yokohama. It has a small outdoor stadium in the heart of Yokohama, just 25 minutes by trains from central Tokyo, with a fair amount of English in the stadium over the PA system and on the scoreboard. Yokohama is pleasant to walk around and see the waterfront and European heritage buildings, so I would recommend spending a few hours there before the game.

Koshien stadium in Osaka is great. You can book tickets easily on the Hanshin Tigers website, the only issue is that tickets do sell out especially for weekend games. I'm not sure if May tickets are on sale yet but you'll want to buy shortly after they go on sale.

I just bought tickets for a Carp game in mid-April and the only tickets left were bleachers/standing room.

Never a problem getting tickets at the Seibu Dome.

Good luck.