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.
But I hope there's actually 
some way I can help.
رغم أنّي أتمنّى أن تكون هنالك 
...طريقة لأساعد بها
Hoffentlich kann
ich ihr irgendwie helfen.
Espero que pueda ayudar en algo.
Espero que pueda ayudar en algo.
Mais bon, je pourrais peut-être
l’examiner moi-même…
Spero ci sia davvero qualcosa che io possa fare...
Tomara que eu possa 
ser útil de alguma maneira.
Надеюсь, я смогу чем-нибудь помочь.