I learned this tip from Zooming Japan, so much appreciation to her for sharing. I want to share with my readers too.

So you’re planning a trip to Japan. You have a smartphone or PC and you’re worried about only having wifi in your hotel room. Flets will give you access to their hotspots around Tokyo (and some other cities). It might not be perfect, but it’s better than nothing. And it’s FREE!
You can use it for 14 days.
Here’s how to get it: http://flets.com/freewifi/service.html
。
。
Wanna Support My Blog?
Click Here to Donate
Click Here to Buy Awesome Nerdy J-History Goods
。
。
。
Finally!
Last time I could only use internet in the lobby of my shitty motel.
This page is useful.
http://japanwifi.blogspot.jp/