Rent pocket Wifi in Tokyo? (No airport)

Hi everyone!
Just landed in Tokyo yesterday and we were in a hurry, couldn't rent the pocket wifi like last time.
I'm trying to find a place where I can go to the counter and rent a pocket wifi right away here in Tokyo. We have a JR Rail Pass so I don't mind taking the train in the city, the only thing we would like to is not having to go back all the way to the airport.

Thanks everyone for your help and sorry for the English!
ありがとうございます!

rent already? if no where now?
still in Tokyo or Tokyo out(which city/town)?

Hi!
Thanks for the message!
We are still in Tokyo, in Ryogoku. We also have a JR Rail Pass to go around :).

You do realise that if you had just gone to the airport, you would have your pocket wifi by now, right?

Maybe you could have that mobile wifi delivered to the place where you are staying at...

Go Akihabara.
http://en.wifi-rental-store.jp/
http://en.wifi-rental-store.jp/shop/abouts/
No closing days in Sep but shop open time not so early.

If travel start from next Mon send to your hotel quickly possible.
(order limit until 4 pm[16:00])

Anyway send e-mail firsr before order.

Have you considered going to Haneda Airport and renting one there? It's a lot closer than Narita.