User blog comment:CureHibiki/Baton Touch and Aikatsu Friends Theme Song!/@comment-3487190-20180204141153

It's likely goint to be new singers that were announced some time ago, but as you say, we're not sure if this is kinda like stage name or real name of realworld singers, and whether "BEST FRIEND" is just the unit name in anime or is going to be a new realworld singer group?.