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.
Huh? Well, yeah, I'd say they're unusual,
.ماذا؟ حسنًا، يمكنني أن أقول أنّهم غير عاديّين
Nun, ich mag sie zwar selten
zu Gesicht bekommen,
Bueno, son poco comunes,
Bueno, son poco comunes,
Oi? Concordo que são incomuns,
А? Ну да, вроде бы редкость,