MY FACELESS CLASSMATE, WAKAO

Mizuno, your average high-school guy, finds himself sitting next to the mysterious Wakao after a seat change. While everyone else in class sees her as a perfectly beautiful, ordinary girl... To Mizuno alone, she appears as a Noppera-bo, the faceless yokai of Japanese folklore! Yet... every so often, he’s actually able to catch rare, fleeting glimpses of her features. In this romantic, often comedic coming-of-age tale, we follow this endearing couple as they navigate through the tribulations of high-school and first love! (Source: Manga UP!) — Description from AniList community (anilist.co).