gari tsutomu kun to ura aka san 　～ sanzan osewa ni natteiru erokei ura aka joshi no shōtai ga kurasu no aidorudatta ken ～ (Associated Names)

Tsutomu is a boy with excellent grades, but his secret hobby is spying on the backstage of erot*c girls on social networking sites. One day, he happens to help a class idol, Marika, and notices that she and RIKA, his favorite girl, have something in common. He unintentionally makes a pass at her and discovers…