Hayakawa Rou is a student at the school where Morinome Shinako teaches. They seem to have some kind of shared history.
Before another teacher shows up.
.قبل أن يأتي أستاذ آخر
Bevor andere Lehrer kommen.
Prima che arrivi qualche altro professore.
Antes que outros professores apareçam.
Пока другой учитель не пришёл.