Board Thread:Questions and Answers/@comment-80.56.183.20-20150508193811/@comment-25968376-20150508200737

Just log in with your Line account and it will all be there (besides high scores and inviting friends, that's the other reason why the game is always online). I heard some stuff about Crystals not transferring if you switch from iOS to Android devices, not sure if this is true since I'm only an iOS player.

Edit: You might need your email registered with Line. Check out this thread.