Ryōsuke Kamiya is a university student whose ordinary life is upended during a private moment at home. While watching an adult video, he is shocked to recognize one of the actresses: it is his quiet and reserved classmate from the same college seminar, Rūka Someya.

Unable to ignore the discovery, Ryōsuke decides to confront Rūka in private. Instead of denying the secret, she confirms her double life as an adult video performer, possibly using the stage name Aine Haruna. To ensure her secret remains safe within their academic circle, Rūka makes an unexpected proposition: she will enter into a clandestine physical relationship with Ryōsuke on the condition that he never reveals her hidden career to anyone at their university.

The story unfolds as a love comedy centered on the tense and awkward dynamic that develops between the two seminar classmates. Their relationship is defined by the strain of maintaining Rūka's secret while navigating the ordinary setting of university life, which contrasts sharply with the hidden world of adult entertainment. The narrative focuses on their private deal, the uncomfortable situations that arise from sharing an academic environment, and the gradual evolution of their connection, which is built on a foundation of secrecy and transactional intimacy.