Fourteen years after a hero's sacrifice defeated the Demon Lord, a prodigious boy becomes a teacher at a monster academy despite being only 14. One of his students, a demon girl, resents him for his age and humanity. He reveals his true strength and purpose at the academy.

Yamada, a ronin seeking a job in the city of Edo. Meanwhile, a horde of dead people suddenly start wandering around. Aiming to escape from the city with the little girl Wheat I met ...

Seton Academy, a school full of animals where, thanks to population decline, there are fewer humans than any other creature. Mazama Jin, an animal hater and the only human male in his class, falls in love with Hino Hitomi, the only female human, the moment he lays eyes on her. However he soon finds himself entangled with various other creatures after he reluctantly joins the 'pack' of Lanka the wolf, the only other member of her pack.