data japanGSky currently offers seven eSIM data plans for Japan. The five fixed data plans range from a free 100MB, 7-day option to 10GB for 30 days. The two unlimited options include 7- and 15-day plans. In addition to the JapanGDP (current US$) - Japan from The World Bank: Data. Free and open access to global development data. Free and open access to global development data. Data. HOME.