Seishun Gestalt Houkai

Asaha Mamiya, a second-year high school student, develops adolescent face loss syndrome, but fears that others will find out about her condition and worries about it alone. The only person who notices her change is her classmate Hijiri Asahina, who is watched by teachers for his flashy appearance and violent attitude. Asaha is pushed around by Hijiri, but little by little she begins to look at herself in a new light. Meanwhile, as Hijiri spends time with her, he also begins to face "something" that has been bothering him for a long time.

(Source: MyDramaList)