After a productive (?) training camp, the club members return to practice every day while sad about your absence. But! You're finally back! Who is it that you see on stage when you rush back to school?

You are overwhelmed by the performance being held in the auditorium and spot an unfamiliar girl on stage. Who exactly is she?

It was the School Idol Association performing in the auditorium?! It seems as though something major has happened while you've been away. An enraged Kasumi declares war and tells you all about the shocking truth.

Lanzhu, the chairwoman's daughter and founder of the School Idol Association, uses her status to prohibit your club's activities and manages to lure Ai and Karin to the Association! Which is better: the Club or the Association?!

Unable to perform otherwise, Karin and Ai defect to the Association while the other members want to stay in the club regardless. Discussions between the two factions are at a stalemate, so you decide to talk to Lanzhu yourself.

You go to talk to Lanzhu and are surprised by the facilities she has arranged for the Association. She has also recruited Mia, a composer of global hits. Seeing all of this makes you unsure about what's best for the club members.

Your concerns deepen when Shioriko tells you that Lanzhu isn't a bad person. What exactly is best for the club? Amidst all that worrying, meeting up with μ's and Aqours brings a long overdue smile to your face.

Honoka invites everyone to practice at Otonokizaka after hearing about the situation at Nijigasaki. The Nijigasaki girls are able to practice properly for the first time in a while and vow to take down the School Idol Association.

The club members decide to hold a guerrilla gig to take down the School Idol Association, but there's no point in a surprise live show without an audience. How will they gather an audience without alerting the school monitors?!

The club has successfully started secret rumors about their guerrilla gig. Now they'll finally be able to perform! People are sure to love the club's performance if they see it. Excitement for the show is skyrocketing!

Everyone works hard to pull off the guerrilla gig, only to be blindsided when most of the audience leaves to watch the Association's own pop-up show. The club resolves to work harder and cherish their remaining fans. But then…