A pair of fillies approach you with a problem. Their favorite book is behaving strangely. What kind of magical shenanigans will you find within its contents?

Another Ponyville is under siege by a swarm of Worm-like changelings, and only one hero can stop them. The one name in this world you need to remember. Shining in the sky after every storm, a speed faster than your eyes. Rainbow. Dash.

(Henshin One-Shot, Kamen Rider Kabuto crossover. Warning: Gen3.5 incoming.)