Takahashi, a human teacher, starts his job at an academy that includes demi-human students.
Takahashi meets Hikari, a vampire girl who is lively and serves as his first demi-human student.
Erika becomes Takahashi's student; she is a dullahan who is shy and concerned about being accepted due to her headless nature.
Yuki is introduced as a yuki-onna girl attending Takahashi's class, bringing her icy and reserved personality.
Kyoko joins the school later and is revealed to be a half-succubus with concerns about her vampiric traits.
Takahashi documents and learns about the lives, struggles, and unique traits of his demi-human students through interviews.
Erika struggles with practical challenges related to her being headless but overcomes social fears with support from classmates.
Yuki tries to express emotions and connect with others despite her natural icy disposition.
Kyoko attempts to reconcile her succubus powers and school life, seeking normalcy.
