Uraaka Mousou Joshi

Onomichi is a shy and unassuming bookworm who's in charge of the front desk at the school library. But secretly, she uploads nudes online, hoping that her underclassman Dougaki will come across her account and recognize her. She constantly fantasizes about Dougaki blackmailing her with the nudes and ravaging her. Unfortunately for her, some other students recognize her from the account, and Dougaki isn't one of them...

(Source: Irodori Comics)