Unbeknownst to all ponies, Octavia also works as an assassin, aside from her cello-playing. When she is assigned the job of assassinating the well-known DJ Vinyl Scratch, she is quick to hunt her down, lest she not complete the job and be severely punished.

However, Octavia finds that her heart actually begins to open up for the mare, and she befriends—something she hasn't done in a while—Vinyl pretty quickly.

Now she is faced with the difficult choice of completing her job of assassinating Vinyl and live, or succumbing to her soft spot for the pony and have both of them die.
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I have noticed that a couple people have said this story is like Assassin's Creed. I have never played the game. I have never seen someone else play the game. I have never even read a description on the game. I have no idea what that game is about, so any similarities between this story and Assassin's Creed are only a coincidence.