How many baseball games did you go to and how was the experience? I am kind of fascinated by Japanese baseball and its on my agenda when I eventually go.
I went to a Giants v. Tigers game at the Tokyo Dome back in 2014. Was pretty enjoyable, stadium is kinda "eh," very similar to the old Metrodome.
This past trip I went to three games:
Yokult Swallows v. Hiroshima Carp at Meiji Jingu Stadium - Wasn't planning on going to a game that day, but I didn't have much scheduled the first full day in Japan in case jet lag got the best of me, but I felt good so I bought tickets before the game. The seats were upper deck, last row, which gave me plenty of leg room. The stadium is old, built in the 1920s, and whatever renovations its gone through don't really modernize it all that much.
Yokohama DeNA Baystars v Hanshin Tigers at Yokohama Municipal Stadium - This stadium is kind of rough. Very cramped seating, especially for a 6'4" American. No armrests, very little legroom. Interestingly, the guy who was doing the announcements spoke entirely in English (a woman called up the players for the Tigers). What was weird was that the guy didn't sound like a native English speaker, but based on the way he pronounced player names he didn't sound like a native Japanese speaker either.
Chiba Lotte Marines v Tohoku Rakuten Golden Eagles at QVC Marine Stadium - Easily the nicest stadium in Japan I've been to. Comfortable seats with plenty of legroom, most food options. The game lasted just shy of 5 hours and I felt comfortable the whole time. Visually its kind of uninteresting, but enjoyed it the most. Also, I got to see former White Sox World Series winner Tadahito Iguchi win the game with a walk off hit.
I'd really like to see a game in Hiroshima. Their stadium was built relatively recently, and looks like what modern ballparks look like.
Overall the experience is very much unlikely American baseball. The cheering sections are non-stop with the chanting and you get a much larger visiting team fan presence than at US games.