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.
Whew, that was nerve-wracking...
...يا إلهي، كان ذلك محطّمًا للأعصاب
Puh …
Qué nervios…
Qué nervios…
Ouah, je suis en sueur.
Cavolo, è stato sfiancante.
Credo, que nervoso...
Ох, какая нервотрёпка...