'Twilight, we need your help once again. I feel something bad is going to happen, and we need your assistance once more - Sunset Shimmer'

Twilight Sparkle visited her alternate human universe once more to answer a plea of assistance, to find out there are somehow very new faces that have somehow been in connection with her friends:
A big muscular man who is a regular to Sugar Cube Corner because of Pinkie Pie?, Applejack regularly visiting a bartender from a very unfamiliar pub/cafe?, Rainbow Dash constantly helping out a group of foreign siblings living in Equestria?, A young girl with strawberry blonde hair attached to Fluttershy?, Rarity is being tutored by a blue-haired noblewoman?, A mysterious young adult seems to be tailing Sunset?, And why does another pink-haired schoolgirl seeming to be her ‘age’ following Twilight all the time?
What in the world is going on!?!?

As she grows to trust these hordes of strangers like her friends, she starts to find out what the call for help is all about, when a mysterious group has initiated a fighting tournament in Equestria mostly for the inhabitants of Canterlot, and how these new faces and the entire fate of the world are linked to them.

This is a crossover of Equestria Girls and The King of Fighters, taken from the events after XIII