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 are you doing at this hour?
ما الّذي تفعلينه في ساعة كهذه؟
Was treibst du um die Zeit hier?
¿Qué haces aquí tan tarde?
¿Qué haces aquí a estas hora?
Que fais-tu ici aussi tard ?
Cosa ci fai qui a quest'ora?
O que faz aqui a esta hora?
Что такое, на ночь глядя?