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.
What's wrong, Sensei?
ما الخطب يا سينسي؟
Was hast du denn, Pauker?
¿Qué pasó, profe?
¿Qué pasa, profe?
Qu’avez-vous, monsieur ?
Prof, ma che hai?
O que foi, professor?
Что с вами такое?