Japanese WiFi has been a bit of an issue for me. In addition to being unable to find free WiFi anywhere other than a small room in Narita airport's Terminal 2, I found the home wifi setups to be somewhat of a puzzle.
In America, the WiFi names tend to be things that people thought up on their own. Cute names like PinkRoom or Jenna'sNET. Or, the default names like Linksys and Netgear. But wherever I went in Japan, the WiFi names were all technobabel. Garbage names that were little more than random strings of characters--these were everywhere!
As a computer guy, most of what I did was reset and setup routers for people. I wondered how literally every home in Japan had such professionally done names. When I finally found the answer at a friend's house, it surprised me.
I guess the popular wireless routers here come preconfigured with both a specific SSID names and login passwords. Or at least that's the conclusion I came to when I found the stick on the bottom of a friend's wifi router. In Japan, they don't do any setup! It's probably the best way to do things. Or at least the most efficient.