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 sisters' relationship aside,
،إذا وضعنا علاقة الأختين جانبًا
Von der Beziehung der
Schwestern mal abgesehen,
Obviando la relación de las hermanas,
Obviando la relación de las hermanas,
La relation entre ces sœurs,
A parte la relazione tra queste due sorelle,
A parte do relacionamento delas,
Начиная с отношений этих сестёр,