This all started with a conversation on http://gaz-works.deviantart.com/art/Gift-Art-Cosplay-333758514

Story so far (but I'm too lazy to start this far back):

After the Umakage was kidnapped by the Akatsuki, Twilight, Applejack, and Rainbow Dash were sent to the sand village to rescue him. When they arrive an old pony attacked Twilight, thinking her to be Twilight Velvet. The elder ends up being Granny Smith, an adviser of the Sand Village, and joined Team 7.

On the way, they are attacked by Spitfire. She was eventually defeated by Rainbow's new Ōdama Rasengan technique, but turned out to only be a body double. Team 7 met up with Team Mac outside the entrance to the Akatsuki hideout. However, the entrance was protected by a Five Seal Barrier, and that the 5 seals would have to be destroyed before they could enter. Team Mac split up and destroyed the other 4 seals.

Time was of the essence, so Team 7 decided to move in immediately. They prepared to remove the last seal.

A crossover of MLP and Naruto. If you aren't familiar with the Kazekage rescue arc, or haven't read it for a while, I'd recommend reading it again. It isn't necessarily required, but the story assumes you know who the characters are, and how the story progresses.