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.
Oh... No, that was just...
...صحيح... كلاّ، كان ذلك
Nun … So ist das nicht …
Ah, no, eso era…
Ah, no, es que…
Ah ? Ah bon, désolé…
Ah, no! Quello...
Ah, não, é que...
Нет, понимаете, я...