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.
A stake through the heart 
would kill us! Probably!
!غرس وتد خشبي في القلب كفيل بقتلنا! على الأرجح
Wahrscheinlich würde
uns ein Pflock ins Herz töten!
¡Una estaca en el corazón
me mataría! ¡Eso creo!
¡Una estaca en el corazón
me mataría! ¡O eso creo!
On meurt si on nous plante
un pieu dans le cœur !
Un paletto piantato nel cuore
dovrebbe ucciderci!
Uma estaca no coração mata! Presumo!
Я умру, если мне в сердце
забить кол! Наверное!