When you come to Japan, you will see postbox everywhere.

this is most common post box,

In some tourist spots like Kamakura, you will see retro and cute post box.

Now, it is so easy to return our WiFi rental kit.
First, please put it into self-addressed envelope…

Then just drop into a mailbox!
You do not need to buy stamps, or write anything!

You can find post box even at the airport.
Narita airport post map.

For more details of returing, our plans or plans or promotions please visit our website.

Pupuru International rental mobile service

Please feel free to contact us if you are looking for pocket WiFi, mobile phone or smartphone.
http://www.pupuru.com/en/