How to Enjoy Plus Contents
After the publication date, touch the album with the ‘update’ label.
If you can't find the update label, touch the 'Management' button on the upper left corner and pull down the screen to refresh.
When the album download confirmation pops up, tap 'OK' to update the album.
Enter the album, and touch the ‘EXCLUSIVE’ tap.
You can see the contents with ‘plus’ label.