It's time for the choir to start rehearsing in earnest, but the AC is broken and it's too hot to think. They move to somewhere cooler, and Rika gives them a song to hone their rhythm. Then, they're swept up in a series of inexplicable events!
It's because you said 
weird stuff to Poppa-kun.
لأنّك قلت شيئاً غريباً لبوبّا-كن
C’est parce que t’as dit
des trucs bizarres à Poppa.
Perché dici cose strane a Popper-kun…
Porque você pediu coisas
estranhas pro Poppa.
Потому что ты даёшь
странные команды Поппе.