eSIMatrix does not offer an unlimited data eSIM plan for Japan. The available Japan‑specific plans are fixed‑data packages with caps of 5 GB, 10 GB, or 20 GB, each valid for 30 days. The largest plan provides 20 GB of data for 30 days at a price of $17.00 USD and uses 5G network coverage within Japan.
Travelers who prefer a higher data allowance can select one of these fixed data plans, such as the 20 GB option for $17.00 USD or the 10 GB option for $10.00 USD. Because these plans deliver a set amount of data for a set period, they can be more cost‑effective for most users, though travelers who consume data far beyond the plan limits may need to seek alternative unlimited‑data offerings.