Sunset Shimmer and her friends have been preparing for one of earth's holidays, one that many have been waiting to participate in for a while. So Sunset heads to school for another day, and hopefully to enjoy time with her friends… however, things start to go downhill when the school is locked down and everyone is told to stay inside.

But it won't be easy staying inside, when several monsters begin to appear and attack everyone.

Follow Sunset Shimmer and her friends as they try to survive the horrors within Canterlot High, and find out the mystery behind the outbreak.