As others have said, Yahoo Japan is a separate company (that shared technology with Yahoo US).
They also moved to Google search results after Yahoo gave up and started using Bing results around 2010, which probably helped them maintain market share (since the Yahoo search transition to Bing was a clusterfuck).
They also moved to Google search results after Yahoo gave up and started using Bing results around 2010, which probably helped them maintain market share (since the Yahoo search transition to Bing was a clusterfuck).