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.
But I know you'll lend me yours, even though 
you're mad, which is why...
،لكن أعلم أنّك ستعرينني كتابك 
...رغم أنّك غاضبة، لهذا السّبب
Auch wenn meine Himari wütend wird,
ist sie ein wahrer Engel, mir ihr Buch zu leihen.
Pero sabía que aunque te enfadaras,
igual me lo prestarías…
Sabía que aunque te enfadaras,
me lo prestarías de todos modos…
Même si tu fais la tête,
je sais que tu le prêteras
Davo per scontato che me l'avresti prestato
anche se ti fossi arrabbiata...
Eu sei que você vai me emprestar 
o seu, mesmo zangada comigo!
Хоть ты так бесишься,
но всё равно одолжишь свой...