Hoshino, Me wo Tsubutte.

How did I end up her personal makeup artist...? Kobayakawa was the class outcast; no one remembered his name, and he spent his breaks pretending to nap. But one evening, he saw something none of his classmates had...the popular Misaki Hoshino's real face! That evening—that very moment—his hectic days protecting Hoshino's secret began! Watch lives change in this apathetic boy meets incognito girl story!!
(Source: K-Manga)