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I haven't read the books (yet) so the story follows the TV plot line.
Spoilers for seasons 1-4.

Red wedding never happened, but Arya went to Mereen and met Daenerys. They formed a relationship slowly but surely. They are planning on conquering Westeros. The story picks up where Arya and Dany are arriving in Westeros, already a couple. It is going to be hard, so will Daenerys sit on the Iron Throne? And will their relationship hold?