This story is a sequel to Friendship Kita!!!!
It was supposed to be simple. Sunset Shimmer had sent Twilight had to go to Amanogawa High to deal with some ancient enemies from Equestria's past, and Jack tagged along to talk some shop with Gentarou, and be backup if necessary. However, that was before he learned the Sirens were packing a set of Switches that made the Zodiarts look like cannon fodder. Luckily, Twilight had the brilliant idea to beat the Sirens at their own game during the Battle of the Bands the Sirens instigated, so Jack decided that a second band would be a good insurance policy. Only problem, he needs a band...
How about a bunch of other Displaced Kamen Riders?
Cross with Tales from a Displaced Wizard by shendari, A Golden Drive Through Equestria by Psyga315, and Harmony Damashi by ANDIE
I am a tad upset that my story wasn't chosen, but this makes up for it.
Sorry! I was originally wanted to had Erick (Kamen Rider Ghost) to appeared in your First Friendship Kita Equestria Girls fanfic. But since you already had plans to finish it. I think that a cameo appearance of him should occur in Season 4, which means that an actual crossover will take place in Rainbow Rocks, don't get me wrong I really like your sequel idea and all, but I'm not forcing you or pressuring you to release it this soon or something like that!
Is this gonna continue too?