Supera link does not provide an unlimited data eSIM for Japan. All of its Japan plans have a fixed data cap, such as the 20GB 30‑day plan priced at $22.28 USD and the 15GB 30‑day plan for $14.99 USD. These high‑data‑allowance options give travelers plenty of bandwidth for browsing, streaming and work, and can be more economical than a pay‑per‑use or unlimited model if you are a heavy data user.
Choosing a fixed‑data plan may be more cost‑effective for users who need a steady amount of data and want to avoid peak‑time throttling or data‑cap limitations that can arise with some unlimited offerings.