TL; DR
Need the quickest, most stable data in Japan? Pick a local Japanese eSIM—it connects straight to domestic networks, keeps latency low, and gives you English-language help based in Japan. Hopping through several countries? A global eSIM covers many destinations but often routes traffic through hubs such as Hong Kong or Singapore, so pages may load more slowly in Japan. Sakura Mobile’s travel eSIM rides on the docomo network and includes English support in Japan plus express backup shipping of a physical SIM or Pocket WiFi in Japan.