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.
Then, there are some vampires who get 
by without relying on that blood...
إذًا فهنالك مصّاصو دماء يمكنهم البقاء
...قيد الحياة دون الاعتماد على الدّماء
Heißt dann wohl, dass es auch Vampire gibt,
die nicht auf Blut angewiesen sind.
Entonces, hay vampiros que viven
sin depender de esa sangre…
Entonces, hay vampiros que viven
sin depender de esa sangre…
Et on dit qu’il y a aussi des vampires
qui arrivent à s’en passer.
Quindi esistono vampiri che possono sopravvivere
senza dover dipendere dal sangue?
Então tem vampiros que vivem 
sem contar com esse sangue?
Получается, есть вампиры, которые
могут вообще обходиться без крови...