With the development of Duel Disks that utilize hologram technology, the card game Duel Monsters explodes with popularity among adults and children alike. It becomes so seriously taken and widely enjoyed, professional leagues and academies begin popping up. All with the dedication to dueling.

Not long after, Twilight's devices lead them right into a proverbial minefield with the detection of a mysterious reading. One that has never been seen before in their world.

What is this new, atypical magical energy being utilized by the girls' new foes?
And what does the sudden emergence of a card game have to do with it?

In a world now occupied by Equestrian Magic, is the threat of new energy and a crop of dark duelists be the final dagger?

One thing's for sure... Sunset and friends won't let it be without a fight.