Board Thread:News and Announcements/@comment-26391060-20140623195519

Android: https://play.google.com/store/apps/details?id=com.aniplex.swordartquest2

iOS: https://itunes.apple.com/jp/app/sodoato-kuesutoii/id884966691?l=ja&ls=1&mt=8

Only users of a phone with Japanese Google Play or Japanese iTunes account can get it. 