Luna, the princess of the Night, decides to cast a spell & use the magical mirror to head to a different universe as a way to discover the humans version of Nigtmare Night. Fortunately, while she still has her magical abilities and can go home, her body has changed to a more human body, complete with clothes, and all of the humans around are about as tall as one of her index fingers.
Meanwhile, six human teenagers are celebrating Halloween, though it's very late. They encounter the princess, and with one accident, Luna begins to hunt them down, filling herself with her newly discovered treats.
Contains safe, non digestive vore, and some mouthplay.
Takes place a bit after the first Equestria Girls, and, though there's humans, they of our world, not the EQG type.