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.
Uh, yeah. Guess you weren't aware of it.
.نعم. أظنّ أنّك لم تكوني مدركة لذلك
Ja, ganz sicher.
Sí. Parece que no lo notaste.
Sí. Parece que no lo habías notado.
Beh, sì. Probabilmente non te ne sei resa conto.
Juro, sim, não deve ter se tocado.
Да, похоже, ты сама не заметила.