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.
I used the term to go along 
with you, but it's outdated!
،كنتُ أقول ذلك لأجاريك فحسب
Dann will ich dich
mal erleuchten.
Yo también lo decía,
pero eso es muy anticuado.
Yo también lo decía,
pero eso está anticuado.
Alors laissez-moi vous dire
Io l'ho usato solo per assecondarti,
Eu fiz igual por educação, 
mas que desatualizado!
Я использовала это слово в разговоре
с вами, но оно уже устарело!