Class C considers various strategies for the special exam, but they all lack a decisive factor. Hirata remains disappointed in the class vote result. Ayanokoji calls out to Hirata, who acts coldly towards Mii-chan who is worried about him.
it's only natural that someone 
else should fill in for them.
فمن البديهيّ أن يشغل أحدٌ دوره
muss natürlich jemand
anderes für ihn einspringen.
un autre élève
doit forcément le remplacer.
è ovvio che sia necessario
 designare un sostituto.
é natural que outra pessoa o substitua.
Вот и пришлось классу выбирать
кого-нибудь взамен него.