Its Kumiko and the third-years last camp.
The auditions for prefecturals are on the first night and announced the next morning.
Even Mayu is aware that shes a ticking time bomb, and she doesnt like it.

She claims not to have transferred from Seira for individual glory.
If she beats out Kumiko for the euph soli, it will rock the boat.
Throughout the episode, Mayu presents a symphony of subtle movements and expressions indicating the discomfort and turmoil within.

Mayu tries one last time to suggest that she forfeit.
Kumiko hits her with the the best players are chosen at Kitauji spiel.
Mayu reveals shes never bought that and still isnt, calling it politeness.

Kumiko is reminded of the bad old days shes tried so hard to avoid in her administration.
Mayu follows her with her own horn, keeping her distance.
The auditions are over.

Kumiko urged her not to forfeit, and she didnt.
The die is cast.
But she shouldve been.

This might be whats best for Kitauji … onpaper.But psychologically?
Kumiko and Mayu are now tied 1-1.
The only chance Kumiko has left is to win the soli part in the Nationals.

And I doubt Mayu will be any less difficult to beat in that audition.
P.S.I guess Motomu confessed to Sapphire this week, and it looks like she rejected him?
And then Kanade gave him a soda as consolation?

Its a little unclear, but also doesnt matter as much as Kumiko getting booted off the soli!