ByteSIM provides several unlimited‑data eSIM options for Japan. The plans are the “Japan – 5G Ultra Unlimited eSIM by KDDI,” available for 7 days, 10 days, 15 days and 31 days, with prices ranging from $29.90‑$79.90 USD. Each plan is labeled as unlimited data, but the description notes that speeds may be throttled after heavy use under a fair‑usage policy. Travelers who need to confirm the exact speed limits or the amount of data that remains at normal speed should contact ByteSIM directly to verify the fine‑print.