After returning from their field research, Glenn and the others spend their days in different ways. On one such day, Leos visits the academy as a guest instructor, and causes a stir by proclaiming himself Sistine's fiance.
By the way...
...بالمناسبة
Ach übrigens …
Por cierto…
Por cierto…
Au fait…
A proposito...
A propósito...
Кстати...