Yes, Giga.Tel offers unlimited data eSIM plans for Japan. The plans are priced between $5.49 and $28.49 USD and are valid for 3 to 15 days, depending on the chosen option. Each plan allows tethering, and the maximum speed is capped at 10 000 kbps for the higher‑tier options or 1 kbps for the lower‑tier options, with a note that speeds may be throttled after heavy use.
Because the unlimited plans are subject to a Fair Usage Policy, speeds can be reduced after a certain amount of data is consumed. If you need confirmation of the exact data threshold or typical speed limits, contact Giga.Tel directly to verify the current policy and any potential restrictions.