Okay, so it in a whole different world made of giant oceans and unique landscapes on the ground and in the air. However in this world, there are two guardians that were forced to be paired up by the gods to make the world. One of them is Aria, and another is Nerus. Aria is the guardian of the light, the peace, and was the creator of the land and seas and creatures that walk the world
Nerus is the guardian of darkness, and the developer of all emotions within the beings, and the bestower of the Seven Deadly Sins on only seven beings to become his right hand men.
However, in order to use there powers, both must make a pack with a group of people, or one person, for they must summon them from the space in which they live in
And for this, Aira chose a cluster of island to hide from Nerus, a group of tribal people swore a pack with her as she promised to give them all of her guidance and power, but would not tell the future nor manipulate any souls who did not wish to make a pack with her, and so she was bound to the isles that the tribe lived on
while on the other side of the world, the technology began to flouish, ships fly through the skies (Almost looking like from Final Fantasy 13) and with it, a man with the power of the largest army, held no pack, but a mere bond, with Nerus, who sought out Aria, to take out a long sought revenge for leaving him.