Common-Sense Monster(2022)

Futsuu to Bakemono

Itou, a socially awkward teenager, finds herself jealous of her classmate Takahashi, who seems to get along with everyone. However, one day, she witnesses Takahashi...eat someone whole!? That's amazing! A monster who knows how to blend right in with humans? Itou definitely needs to be her friend now!

(Source: Yen Press)