Hayakawa Rou is a student at the school where Morinome Shinako teaches. They seem to have some kind of shared history.
See you, Sensei.
.إلى اللّقاء يا أستاذة
Bis bald, Frau Morinome.
Adiós, profesora.
Adiós, profesora.
Au revoir, madame.
Alla prossima, prof.
Até mais, sensei!
До скорого.