Unfortunately, there is no way to retrieve it. You will have to remake it. Make sure it is well fleshed out and clearly explained. Make sure you have enough information about the various clans and such. Some goals other than "Make it through 10 generations without having children taken away" would be nice. As an "end goal" that's ok. But more goals would make it more interesting and make more of a challenge vs simply Naruto style game play.