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.
The demi-humans who have been used 
as motifs in myths and fairy tales.
أنصاف البشر عينهم الّذين استُعملوا
.كمواضيع للخرافات والقصص الخياليّة
Diese Halbdämonen entspringen
dem Motiv eines Mythos oder Ammenmärchens.
Estos fueron usados como motivos
en mitos y cuentos de hadas.
Estos fueron usados como motivos
en mitos y cuentos de hadas.
comme dans les contes
et les légendes.
Le stesse creature che
hanno sempre popolato fiabe e leggende.
Meio-humanos de mitos e contos de fada.
Они стали прообразом героев
мифов и сказок.