The holidays are getting close. Everywhere you go, cheer is in the air. Well, almost everywhere. Canterlot High School is being terrorized yet again. But this time, however, instead of an alpha bully turned brainwashing demon, or a triad of hypnotic singers, the school is now the target of a of cyber attacks by the eponymous Anon-a-Miss.

Sunset Shimmer has found her back against the wall. CHS believes that she is the perpetrator behind Anon-a-Miss and the Rainbooms, her supposed best friends, have left her side, turning their backs on her. Desperate, Sunset seeks help from Princess Twilight, even as she continues trying to plead her case to the school.

As the holidays continue to close in, a girl wakes up in the hospital with no memory of where she's from, what happened to her, or even who she is. She has no ID and just when it seems like no one will come for her, she is taken in by her family, to help her recover from her injuries, both physical, and mental.

However, Anon-a-Miss' presence still looms over Canterlot High School, CHS being held within their strong grip as they continue to spread secrets and rumors about the students. As the holidays come and pass, two questions remain. Who is Anon-A-Miss, and who is this mysterious girl, whom is trying her best to rediscover who she is.