Based on the movie Edge of Tommorow (Which I haven't watched yet)*
This story has mature words even though it is stated as Teen because as you know, Teens these days start swearing a lot, so yeah.
Frontier Wing, an ordinary pegasus, finds himself in an odd predicament as he has to relive the same day over and over until he stops this new threat along with The Mane Six. However, each day will be different with something new in store and only he will remember the events of the 'Previous' day. Will he succeed? Will he fail? Who knows? Find out when you read Edge of Equestria!

*=To elaborate, this uses the concept in which the hero relives the same day over and over until he defeats the threat or solves the problem or something.Anyway,enjoy!
Oh yeah, can anyone give me cover art, thanks.