Hated by some, loved by many. Go here for a standard cup of coffee, a special sweet drink and of course the internet connection. For a connection, all you need to do is create a sort of ID. This is done through, yes, the internet. So be sure to apply yourself before your visit at home or somewhere where you do have a connection. Locations all over Japan, usually around stations.
Sign up for Wi-Fi: http://starbucks.wi2.co.jp/pc/index_en.html
Photo courtesy of culture.cdjapan.co.jp