12 students from Class 1A are picked to be transferred from UA High in Japan over at Canterlot High in America for three weeks. And upon their arrival, they come face-to-face with the Rainbooms; and befriend the group.

However, the visit takes a turn when new threats arrive at Canterlot High with plans to take down society as a whole.

Now Rainbooms and the hero students must work together to stop them.

Spoiler Warning: Takes place in Season 5 of MHA; though somewhere between episodes 106 & 107.