Itazura na Kimi ni Mask Koshi de mo Koi wo Uchinukareta

Asayama Mamoru falls in love with Saaya Ryoukai, the most mischievous girl in school. He joins the school festival committee to spend time with the senior Saaya, but he is stuck in the position of a mere junior. One day, a student at school becomes infected with a new type of virus which causes quite a stir. To prevent the spread of disease, the students are quarantined at school for two weeks! The sudden start of their shared life together brings Mamoru and Saaya closer and closer...! The start of an agonizingly sweet, adolescent love comedy from behind the mask!

(Source: Piccoma, translated)