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.
Just thinking meeting demi-humans 
is easier than I realized.
لا شيء، كنتُ أفكّر فقط أنّ مقابلة 
.أنصاف البشر أسهل ممّا اعتقدت
Ach, mir wurde nur klar, wie leicht
man doch Halbdämonen begegnen kann.
Pensaba que encontrar
semihumanos era muy fácil.
Estoy pensando que encontrar
semihumanos es muy fácil.
C’est rien, c’est juste
toutes ces ajin d’un coup…
Riflettevo sul fatto che incontrare semiumani
è più facile del previsto.
Ah, nada. Encontrar meio-humanos 
é mais fácil do que esperava.
Да подумалось, как просто-то,
выходит, встретить полулюдей...