Board Thread:Questions and Answers/@comment-21206022-20130919105029

I read about Bibi, Lily White, and Printemps from Wikipedia but I'm confused. The groups seem... random. I would have thought the groups would consist of the first years, second years, and third years, since the members in the same year are especially close (Maki is a new edition but it seems she gets along best with Kayo and Rin, while Nico isn't really especially close with anyone). How did the groups get chosen, then? By how good they sound together? 