Thank you for the info., Steve M and O sora.
After disappointed with the wi2 service, I'm glad to know there is a hope to get a data service available for visitors.
I thought it may not be a bad idea to buy their pocket wifi for Y19,740 and buy a SIM for Y2940 whenever I visit Japan, instead of paying Y1500/day to rent from telecomsquare.
Do I understand correctly? As far as I use HP SIM (300kpbs or best effort), am I am stuck with the 300kpbs limit even though the pocket wifi is capable with the speed, 7.2Mps/5.76Mps.