I haven't been to Japan before but there are sushi selling here too. Have you try any sushi? Well, I really miss eating sushi and I have thought about going for buffet. But its really expensive. One person cost about $80. It's like all you can eat! You can eat as long as you can but I am sure everyone has a limit on food.
There are other restaurants with Japanese Food but I don't know how their food taste like. I was told by friends that some restaurant cut the portion of salmon real small. That's not nice to eat at all.