Yes, Yoho Mobile sells unlimited‑data eSIM plans that work in Japan. These plans are available for 1 day up to 30 days, with prices ranging from US$1.00 for a single‑day plan to US$79.20 for a month‑long plan. Each unlimited plan includes 4G and 5G connectivity, allows tethering, and specifies a maximum speed of 5000kbps, with the possibility of speed throttling after heavy use.
Because Yoho Mobile applies a Fair Usage Policy, the normal speed may be reduced after a certain volume of data is used. If you are concerned about potential speed restrictions, check with Yoho Mobile directly to confirm the typical amount of data that remains at normal speed before throttling applies.