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.
Vampires are provided with 
blood by the government.
.توفّر الحكومة الدّماء لمصّاصي الدّماء
Vampire werden vom Land
mit Blutbeuteln versorgt.
El Gobierno provee de sangre
a los vampiros.
El Gobierno provee de sangre
a los vampiros.
Le gouvernement nous donne
une pochette de sang par mois.
Ai vampiri viene fornito sangue dal governo.
Vampiros têm sangue 
fornecido pelo governo.
Государство обеспечивает вампиров кровью.