User blog comment:SingMeloetta/Theory:Where is Elza From?/@comment-26426093-20170616011444/@comment-31969804-20170619071136

But Rei is from france and Koharu was scouted from Italy, and Elza likes to pick one Idol from 1 place unless she needs a bait to get the ldol she wants. like the Shiratori Hime case where Elza needs Koharu to get Yume and Yume to get Shiratori Hime. thats what l think BANDAI's logic is.