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.
Well, the number of demi-humans 
is really quite low...
.إنّ أنصاف البشر قليلون للغاية بالفعل
Damit der Empfang glimpflich verläuft,
haben wir einige Vorbereitungen zu treffen.
Bueno, no hay muchos de ellos…
Bueno, no hay muchos de ellos…
Ils ne sont pas très nombreux…
Beh, non sono poi così tanti, no?
O número de meio-humanos é bem reduzido.
Ну, всё-таки их так мало...