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.
"Demi-human" doesn't sound 
cute at all, does it?
عبارة "نصف بشريّ" ليست ظريفة، صحيح؟
„Halbdämon“ klingt
einfach arg abgedroschen.
"Semihumano" no suena lindo, ¿verdad?
"Semihumano" no suena guay, ¿verdad?
« Ajin », ça sonne pas très bien !
"Semiumani" è totalmente fuori moda, non trovi?
Meio-humano não é 
nada fofo, não é verdade?
Ведь «получеловек»
звучит совсем не мило!