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.
Sorry, sorry, sorry...
...آسفة، آسفة، آسفة
Entschuldigung, Entschuldigung,
Entschuldigung …
Lo siento, lo siento, lo siento…
Lo siento, lo siento, lo siento…
Pardon, pardon…
Scusi, scusi, scusi...
Desculpa, desculpa, desculpa.
Простите, извините...