Futsuu to Bakemono

Ito-san, who has a communication disorder and longs to be "normal," secretly admires her classmate Takahashi-san, who is mild-mannered and gets along with everyone. However, one day, Ito-san ends up discovering Takahashi-san's true identity! Ito-san decides to learn about "normal" human society from Takahashi-san, a monster who mimics humanity. But will she really be able to blend in with society!?

(Source: Kadokawa, translated)