[Button Mash] is also present in this story.

Rarity and her sister Sweetie Belle lived in Canterlot. When their parents tell them that they are going to be traveling for an indefinite amount of time, they ask the two to watch over their home in Ponyville until they get back. Naturally, they agreed and soon moved into their parents' home.

Being in a new environment, Sweetie Belle went to the local school in town. Being the new kid in class was overwhelming and she had yet to make friends with her classmates. Fortunately for her, it's Nightmare Night and there's going to be a costume party at school later that evening. She realizes that this is the perfect opportunity to make friends, but the problem is, she doesn't have a costume! Will she make it to the party on time?

I apologize if the lack of a cover bothers you. I tried to find something, but I just couldn't figure out what could represent this story for the life of me.