The show takes the supernatural premise and immediately throws it away, replacing monster politics with whether a succubus can control her charm powers around her crush. A biology teacher genuinely curious about his demi students becomes the emotional anchor that makes their everyday problems feel earned instead of cute for cute's sake. You're not waiting for conflict to arrive; you're watching it dissolve the moment characters actually talk to each other like people do.

Tetsuo Takahashi, a biology teacher at Shibasaki High School, has always been fascinated by demis, half-human beings who were once persecuted but are now accepted in society. In his fourth year at the school he finally gets demi students: Hikari, a lively vampire who loves tomato juice; Kyouko, a shy dullahan who struggles to socialize; and Yuki, a snow woman who keeps her distance for fear her powers will hurt someone. He also works alongside Sakie Satou, a succubus math teacher who constantly holds back her seductive ability. Through casual interviews, Takahashi learns about their abilities and daily lives, helps with their problems, and finds that demis are less unusual than he expected. The slice of life treats the supernatural as everyday life.