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--!?