A tale of a girl’s reckless journey, fueled by the intertwining of youthful anxiety and longing! Itoo-san, who struggles with interpersonal relationships, envies her classmate Takahashi-san, who is modest yet gets along well with everyone. One day, Itoo-san witnesses Takahashi-san swallowing someone whole. Takahashi-san is actually a monster disguised as a human! A terrifying creature seamlessly blending into the class―― how utterly enviable!! I absolutely want to be friends with Takahashi-san!! Itoo-san decides to learn about the 'normal' of human society from the monster, Takahashi-san. While Itoo-san is excited, Takahashi-san has her own agenda... A collaboration between a talented author and a rising illustrator from 'Youjo Senki' presents a tale of a girl’s reckless journey, fueled by the intertwining of youthful anxiety and longing!