It's that time again...
*UPDATE TIME!!!*
We got a far more light-hearted episode this time around. Our trainees spending their day off in various ways.
On an intriguing note, I noticed that the Manager has not a Heart in her hair, but a Diamond like the kind you would see on a playing card. I think I also saw Tomochin's mother have the same Diamond in her hair. Maybe there is some deal of significance to this, as all the idols have Hearts in their hair. I doubt that the difference is purely coincidental.
Also as Sylphin brought up, all of the previous Centers have disappeared due to unexplained circumstances. I think there is an interconnected web or things relating to this. One having to do with "Sensei-Sensei", the Kirara, and the "Soul of the Idol." Acchan was described as having so many Kirara light up around her that she was cloaked in a dress of light. The Kirara are supposed to shine when in the presence of a "Soul of the Idol" so it's safe to say that Acchan had a soul that shined brighter than any Idol. I think that in order to be a Center, one would have had a "Soul of the Idol" just as strong as Acchan. Now here is where I get speculative. I personally think that the weird dark void behind the Torii gate with the Miko standing beside it is this "Sensei-Sensei." It mentioned some deal of interest in the current batch of Idols, so I think it has some interest in the "Soul of the Idol" for purposes unknown, beyond having charismatic Idols that enrapture audiences. I also think that the Kirara are messengers or "embodiments" of the void behind the Torii (aka Sensei-Sensei) who seek out those with the "Soul of the Idol." When a large amount of them are drawn to a single girl, the void's focus on the girl in question reaches critical mass, and she is spirited away by the void behind the Torii (aka Sensei-Sensei) for some other purpose. Though at this point, I don't really feel that Sensei-Sensei "true purpose" for the "Soul of the Idol" is evil or malicious. I have no evidence to support that, it's just a feeling I have.
Granted this is all just speculation on my part, and I could be completely wrong.
As for the content proper it was a nice little episode. I wonder if Orine and Yuka are gonna get close to Chieri again. Chieri doesn't seem to be fully tuned into the power of friendship just yet, but I think she and Yuka will come around eventually. It was also quite funny to see Mimori and all her "Pheromone" laced glory. She might want to invest in a good sports bra however (actually, screw that, because I couldn't see her jiggle otherwise). It was also equal parts amazing and creepy to see the Itano family as a true lineage/dynasty of Tomochins.
Also as a final note, I don't think episode 4 will be the last we see of Kanata's misconception on what being an Idol is all about.
Keep 'em comming Satelight! I am hungry for more crazy awesome Idols, melodrama, friendship (hopefully some Class S friendship), and pheromones.

Winter 2016 Anime Theme Songs Skillfully Covered
Osomatsu-san’s Iyami Takes The Mound
Asuna’s Rapier Radiantly Recreated
China Elevator Woman “Starved To Death Over Month”
Goddess of Twitter: “Flat is Justice!”