There are a lot of Japanese restaurants in Jiaxing, but this is one of our two favorites; unsurprisingly the other is owned by the same people. This is the smaller of the two, but the food is quite good.
They have an "all you can eat" option that includes almost everything on the menu (except for some of the higher end steaks) and unlimited soda and beer for RMB188 (US$30/HKD$230).
I would definitely come hungry. Our staples are the fish sashimi, the potstickers and beef fried rice; that being said almost everything is excellent.
The staff speaks limited english, but the menus are full of pictures and there is usually not a lot of drama to get orders figured out.
It's a little bit hard to find, the entrance to the restaurant is through a multicolored sliding door, about half a block south of the Kras Dayton Hotel on the corner.