User blog comment:Lilyshirogane2201/Aikatsu x Aikatsu Stars collab/@comment-31567220-20170723135507/@comment-3487190-20170723163126

Well if that's what Suni-re-san meant, well since this is very likely a non-canon story, i suppose it'd be a "what-if" crossover, such as "what if two schools co-exist and have a freindly activity together". That's what two episodes can handle.