Yahoo Japan Ads data is absent from most reporting setups
Japan is one of the few markets where two paid search platforms hold meaningful audience share alongside each other. Most reporting setups treat Google Ads as the primary and only paid search data source — because it is everywhere else in the world. Yahoo Japan Ads data is either reported separately, reported manually, or not reported at all in a form that can be compared directly to Google Ads performance. The result is a gap in the data that prevents any honest cross-platform comparison.