Yes, 150yen
they will calculate at 200 yen a liter if you have large formats above 750. I bring in 3L and 5L sometimes and that is the method.
Here it is in Japanese. The English site omits wine.
http://www.customs.go.jp/kaigairyoko/zeigaku.htm
Do they actually bother collecting when you bring in a few liters like that?
The commercial duty is only 70 yen per liter so there is no tax excuse for high wine prices in Japan.