1화: 시자키 고등학교에서 생물 교사 타카하시 테츠로가 새로운 수학 교사 사토 사키를 만나다

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. (Source: Crunchyroll)

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