Nobody can believe their eyes at the corpse that appeared from within Shiki's room. They try to figure out what happened, but the room was completely closed off, which only makes the plot thicken.
So when you were in fifth grade, 
you met Saikawa-sensei.
.إذًا عندما كنتِ في الصف الخامس قابلتِ سايكاوا-سينسي
Was ist passiert,
als du Professor Saikawa
Entonces, conociste a Saikawa-sensei
Entonces, conociste al profesor Saikawa
Et quand tu l’as rencontré
à cette époque,
Então, você conheceu o Saikawa-sensei quando
estava no quinto ano do ensino fundamental.