Filter-goshi no Kanojo

Narumi Hakobe is a stone-faced high schooler. He never stands out in his class, and his one joy in life is following the sexy selfie social media account "Effa." But he would soon find out that "Effa" was actully Koto Mitsuha, the most popular and straight-laced girl in his class... So begins the naughty teen selfie romcom between the iron-wall selfie girl and the stoneface boy!!

(Source: MangaHot)