Kamen Rider Build, the briiiiliant physicist Sento Kiryu, has found himself in Ponyville with no memory of how he got there. However, he quickly finds that new Smash are here, too, created by a mysterious villain named Faust who quickly steals all of his Full Bottles. Now Sento has to "build up" a new arsenal of Best Matches and fight back, but what is this Faust really after?

Are You Ready?

(Kamen Rider Build crossover, from a gap in the middle of episode 13.)