Takahashi Tetsuo, a biology teacher at Shizaki High School, has been fascinated with "demi-humans," beings with characteristics that differ just slightly from humans, since he was in college. He wishes he could have a chance to talk with one, but since the demi-human population is fairly low, he's never even met one. But then the school gains a new math teacher, Satou Sakie... who happens to be a succubus.
This is why I asked this morning 
if you'd forgotten anything!
لهذا السّبب سألتك هذا الصّباح
!إن كنتِ قد نسيتِ شيئًا
Deswegen hab ich dich
heute Morgen gefragt,
Por eso te pregunté en la mañana
si no olvidabas nada.
Por eso te pregunté por la mañana
si no olvidabas nada.
Je te l’ai dit ce matin,
È per questo che stamattina
ti ho chiesto se avevi preso tutto!
É por isto que pedi de
 manhã para não esquecer!
Ведь спросила же утром,
ничего ли ты не забыла?