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.
I love you so much!
!أحبّك يا أختي
Ich hab dich lieb, Schwesterchen!
¡Te quiero!
¡Te quiero!
à ta grande sœur adorée !
Ti voglio tanto bene!
Te amo tanto!
За это я тебя так люблю!