What happens when a demi-obsessed researcher meets a vampire, a dullahan, a snow woman, and a succubus? A whole lot of learning, that's what! Meet Takahashi Tetsuo, a researcher obsessed with demi-humans, aka demis. After starting his new job as a science teacher, he discovers that this school has three demi students and a demi teacher. With these subjects close at hand, Takahashi does the only thing a dedicated researcher can—interview them! But he quickly discovers there's more to them than the stories and rumors claim. Between struggling to fit in and dealing with adolescent pressures, Hikari, Machi, and Yuki show Takahashi there's nothing more complicated than being a teenaged demi! So he decides to help them out, no matter what. As he learns more about them, Takahashi finds that his research does more than just educate—it also helps the girls learn to accept themselves and connect with one another, making high school just a little bit easier for everyone. Together, they'll prove that there's more to demis than the legends reveal!