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.
So she's basically one of 
those, right? A dullahan.
لذلك فهي واحدة من الّذين 
يُسمّون الدّولاهان، صحيح؟
Es uno de esos, un dullahan.
Es uno de esos dullahan.
Perché è una di quelle, no? Una dullahan.
Ela é uma daquelas, não? 
Uma dullahan.
Так она же одна из дуллаханов.