The Twins of the opposite Land

In the land of Eden there were two villages that is living in there,
In the east side where the sun rises, the village was called "the promised land" wherein the clan that live there have "angel bloods"
While on the west side where the sun sets, the village was called "the cursed land" wherein the clan that was there have "devil bloods"

Then came the twins of the opposite clans, what will happen between the four young girls, will war rise? will they be friends?