Please do not take this version of the information without permission, thank you.
The Runway, Harajuku Threads, and Mix and Style were originally based on JAKKS Pacific's doll line "JUKU Couture" back in 2009. Because of that, in OLD AGA, the three stores were labeled under the JUKU Couture category. The Runway and the other two stores are no longer based on "JUKU Couture".
Fun Feature Edit
It seems to be that if you walk to the end of the runway, avatars will take pictures of you and the judges avatar talks by itself pretending as if they're talking about you. This feature was not here in OLD AGA nor when the Runway was just changed to Harajuku in 2010.