Socially awkward teenager Itou is jealous of her kind, unassuming classmate Takahashi who gets along with everyone. One day, however, she witnesses Takahashi...devour someone whole. It turns out the girl's actually a monster-and one who can blend in with humans, no less! Full of admiration, Itou really, really wants to be her friend. Takahashi begins to teach her how to act 'normally' but...will Itou succeed? And what is Takahashi truly after?