I think I get the gist of the segment of this week's ep.
It is like they give trivias about themselves.
For example, we know that Ririe is a bisexual.
Here are other facts:
-Sina was a kabajo
-Yume has an elite family with a father as a teacher and a grandma as a policewoman
-Ririe lost 15 kg. thanks to ParaParaParadise
-Miku has a cute sister
-Aika is a college graduate