ガリ勉くんと裏アカさん　散々お世話になっているエロ系裏垢女子の正体がクラスのアイドルだった件

Synopsis

Want to Peek at the Erotic "Other Side" of the Class Idol? Bookworm high school student Kariya Tsutomu's secret hobby is scouring erotic "裏垢" (uraka - hidden/alt accounts) on social media. Tsutomu, who especially worships a big-breasted high school girl on a hidden account named "RIKA" like a goddess, diligently collects the erotic photos she uploads daily. One day, Tsutomu saves the "perfect beautiful girl" in Staff Room, Tachibana Matsurika, from a pinch, and by chance learns her "secret". For some reason, she then suddenly gets close to Tsutomu and starts revealing a side of herself she shows no one else--!?