You have 3 other friends who are all angels and 2 brothers and  2 sisters who are dark angels and the king of skyloft wants you and your three friends to go into battle along with the army men of skyloft and you have to decide if you  WANT to fight your blood related brothers and sisters or you will give up and turn away from killing your brothers and sisters. The king wants you to fight but says it's YOUR choice if you want to or not

Here's the story