Pocket WiFi

I dont recommend Pocket WiFi in Japan unless you really have to.

Rent

Go to website and fill in some details. Make sure you check how much data is available for 3 days / 7 days / per month. Once you used over this limit. They will speed limit to 200Kbps ~ 1Mbps (unusable).

Rent 7 days, 2 weeks, 3 weeks probably same price as renting for a month.

Use

Once delivered. The Pocket WiFi usually has SSID (name to connect to WiFi) and password (they often call KEY here).

Return

Either Konbini or Post Office (ゆうパケット).

NETAGE gave you a return ゆうパケット with address sticker so you don’t have to write. Consider this is a ¥500 discount worth.

If you forgot to return, usually the contract automatically extended.