This is probably the case. I know it was the reason I bought First Kiss in the first place (of firsty firstness... ).
I believe Reina was the "bait" in this case (like Yaguchi was in ZYX). Who whould have shown interest in Aa! but for Reina's sake?
I hear he has something involving Chinese people in the works!
See? Tsunku knew what he was doing back then. What has he been doing now to boost MM's sales? Not freaking much