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 did say you could come by anytime, but...
صحيح أنّي قلتُ أنّه يمكنك المجيء
...متى تشائين، لكن
Ich hab zwar gesagt, du seist
jederzeit willkommen, aber …
Dije que podías venir
cuando quisieras, pero…
Dije que podías venir
cuando quisieras, pero…
Je sais que je t’ai dit
de passer quand tu veux…
Anche se ti ho detto che
potevi passare in qualsiasi momento...
Tudo bem que disse que poderia
 vir, mas vamos combinar, hein?
Да, я разрешил приходить
в любое время, но...