Japan Rail Pass Potable Wifi (Pocket Wifi) Rental Service
Japan Rail Pass provide Rental Pocket wifi service.
You can have your Pocket Wifi delivered to your hotel in Japan or pick it up at airports.
Late returns will incur a charge of 400 JPY per day, and lost devices a flat fee of 20000 JPY.
Unlimited data, recommended for use in urban areas!
UQ WIMAX offers a plan, allowing you to use the data up to 3GB in 3 days.
It is well connected in urban areas, however, it may have trouble in some rural areas yet.
You don't have to worry about it too much if your connection is limited after you over the data capacity.
Because their official website announces that even in that situation, they offer the internet speed allowing you to watch YouTube relatively smooth.