This app does work, but only for “network printing.” Open a document or picture (you can access your phone’s files by pressing the orange button on the bottom row) in the app, select your size, then press the upload button. It will show a number that you can enter into a family mart printer if you select “network printing.” Rather difficult to navigate, but still a functional app.
Orlagh3,
Does not work
This app does not actually connect to the machines at FamilyMart in Japan. For that, you must use Print Smash, which is unavailable on the US App Store.
Request resources and features to be hacked
The app will be hacked within three days of your request