It's Una here! Enemies are invading the town we live in. How nice would it be if you helped me defeat the enemies. Let's summon a character and defeat the enemies. You need SP to summon a character. Use all the SP and summon a character. You can merge identical characters of the same grade to get a higher grade. There is a lot of enemies surgign. Try using a magic card to deal with the crisis. You need MP to use magic card. MP is recharged automatically after certain period. But it will not exceed charge limit, so be sure to use it when it's full. Killed monsters appear at opponent's camp, so keep the timing wisely. You can now keep dealing with the enemies and hope you can lost longer than your opponent. I forgot to tell you the most important thing! It's the rules of victory and defeat.