When Google was using map data from Japan's the most excellent mapmaker ZENRIN, the quality of Google Maps was really good. But now, they probably stop using it. Instead, they use their own map data for Google Maps. The accuracy of Japanese Google Maps has degraded considerably!!!
In Japan, many people are complaining about the new Google Maps. When you search with an address, sometimes they don't show the place properly in March, 2019. Some details are lost such as bus stops, narrow roads, walking trails and so on.
So you should double check just in case using Google Maps and other map apps or websites while traveling in Japan. I know another good map for the iOS app in the English edition below.
If you have any suggestions please comment on this blog page.