Tetsuo Takahashi is a biology teacher with a professional interest and personal fascination with demi-humans, like vampires, succubi or head-carrying dullahan. Having never met a single one, he ends up meeting four at once as three demi-human freshman students and one new teacher show up at the high school he works in. An actual recommendation. Not only did I thoroughly enjoy watching this one, it also has feminist merit! Enjoy the feeling while it lasts, this may be it for a few months.

An anime television series adaptation by A-1 Pictures aired between January and March The story takes place in an age where demi-humans, more casually known as "demis", have slowly started to become accepted into human society. Tetsuo Takahashi is a biology teacher who ends up teaching three such demis, hoping to understand more about them while also managing to catch their attention. Petos began serializing the manga in the first issue of Kodansha 's seinen manga magazine Young Magazine the 3rd on 5 September An anime television adaptation was announced on 3 September

Tetsuo's job as a high school teacher gives him lots of chances to research demi-humans, including a vampire, a succubus, a snow woman and a dullahan. After never having met a single demi-human in his life, Tetsuo meets four of them in one day at the school where he works, including the new teacher. One of only three dullahans in the entire world, Machi grants Tetsuo an interview after school. Then Hikari arranges an experiment. For a succubus like teacher Sakie Sato, living a normal life can be a challenge.