This story takes place in the same universe as Summer Sun Tournament, but the events occur separately and unrelated to each other.

Apple Bloom, Sweetie Belle, and Scootaloo love playing Duel Monsters, but they're not the best at it. But when strange cards called Numbers start popping up around the school and making their classmates go crazy, they're the only ones who can stop it. Can they handle the responsibility of protecting the school? And what's with the weird floaty guy? (I still suck at summaries.)