If you use Android device, Google Plus is automatically linked to your game when you start the game.
However, if you lost your Google Plus account or change the device which Google Plus is not used (iOS), you cannot load your game information.
Therefore, please link the game to facebook or E-Mail address to keep your information safe.
◆ How to Link
- Access to the Game -> Admiral Info -> Setting -> Account-> Link Account -> Google / E-Mail