Falling for Her Secret Side

Unassuming bookworm Tanaka Minato never imagined he'd cross paths with the cold beauty of his high school, Saito Rena. But after a chance encounter reveals their shared love of books, they start meeting in secret, bonding over literary discussions. To fund his hobby, Minato works part-time in disguise to avoid breaking the school's no-job policy. At work, he often seeks advice from his co-worker, Hiiragi Rena, about his peculiar situation. Yet, something about Hiiragi feels strangely familiar...

(Source: Manga UP!)

Note: Includes one extra chapter.