So SyngUp had a "teacher" graduate idol that Temari ended up picking a fight with because she equated singing skill with qualifications (thus saying Rinha was better than that teacher).

So their unit participated in a very competitive 1v1 live where they would be able to sing Campus Mode if they defeated her, but with their dissolution if they lost.

Temari and Misuzu did intense training with Rinha to catch up. Of course, they ended up winning and became the top unit in middle school that was able to gain the privilege of singing the song.