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.
And then, when I get a look 
at the nape of her neck...
...وحينها، عندما أنظر إلى مؤخّرة عنقها
Wir haben beide ’ne
Hitzephobie.
Y luego cuando veo su cuello…
Y luego cuando veo su cuello…
Et dans ces moments-là,
à la vue de son cou si proche…
E in quei momenti,
quando osservo la base del suo collo...
Aí, quando vejo o pescoço dela, penso que...
Стоит мне глянуть на её затылок...