You play as the Producer from the same timeline of your regular gameplay, after Ryuuguu Komachi loses the nomination to the Idol Academy awards against Touma but before your unit goes to the finals.
Seeing that the RK members lost all the motivation, Ritsuko asks the Producer to help as a "support Producer" taking care of one of the girls instead of her.
With you as a new support, RK participates in the Idol Ultimate tournament (was the main event in IDOLM@STER SP) with a new set of clothes and a new song: "Nanairo Button".
Each extra episode consist in three weeks, each one facing a rival in a festival, and before and after the battle you do some automatic communication sessions that develops the story. Ryuuguu Komachi level ups and gains memory appeals automatically, so you don't have to do anything besides try to aim for a perfect communication and win the festivals.
Each of the four girls have an unique story. Only 6 communications seems rather short, but the main game doesn't include many more than that so in comparison the lenght of about one hour is rather acceptable.
Iori was humiliated as the trio leader with their defeat against Touma, and gets more angry once meets with him, who's also participating in the IU as a member of Jupiter at the same time is participating against your unit in the IA awards.
Adding insult to injury, Touma doesn't even remember her and on the contrary remembers the Producer.
After a series of tsun tsun episodes, Iori gets pretty dere dere with the Producer before the final match against Jupiter.
So at the end RK wins and all is laughs and happiness with you...
Well, at least until you tumble onto her and you get called a mega pervert.
Azusa is leaving to one side her search for her fated one for a while and instead focuses in her role in the RK unit as the more mature one. She progressively relies more and more into to you as the Producer, until you say that her true Producer is Ritsuko. She gets depressed until you says that is not necessary to meet only one fated person, that all RK members and their fans are "fated persons" to Azusa.
After winning against Jupiter, she rejects Hokuto, who was flirting with her.
In the party after winning the IU, all members of RK cunningly leave Azusa alone with the Producer, and she bashfully ask what he will do if she finds her only one fated person...The wish she asks at the end is to have 100 more wishes...
Out of the four Ryuuguu Komachi members, Ami is my least favorite one, so the summary and photos will be scarse. She acts very childish (even more than usual) and seemingly without any worry, but all was a facade to hide she was really nervous fearing another lose in the finals. You promise her that if RK win, you will fulfill a wish. Ami gets pretty excited about it and wins the finals.
If you select Ritsuko, she gets pretty astonished since she thinks the members with troubles are the other 3 girls and not her, but she accepts the offer. She works as a producer "as it says on the book", and because of that is somewhat strict with the girls. Producer says that every producer have his or her own way to do the things, and a confident Ritsuko overworks even more her unit, so at the end you need to restrain her and sugest that she should communicate more with her unit.
Ritsuko is quite happy with you teachings, and says that if is not by the Producer, her unit would not stand a chance in the finals.
RK wins the finals, and all the members call Ritsuko to do the encore together, since she is also a member of Ryuuguu Komachi. Since the game can't do 4 persons performances, they also call Mami and together do "Smoky Thrill" as a quintet.