Hina Takigawa presents a conventional and respectable appearance as a student at a locally famous all-girls school, masking her ordinary high school life. Privately, she harbors a hidden exhibitionist fetish driven by the thrill of potential discovery. She regularly visits a secluded park area after school to engage in public urination and masturbation, deriving intense arousal from the risk of observation.

Her secret remains concealed until her boyfriend, Yonezu, secretly follows her and witnesses her behavior. He confronts her about this fetish, expressing dissatisfaction with their conventional sexual relationship. This discovery acts as a catalyst, leading Yonezu to propose incorporating her exhibitionist tendencies into their shared activities. They subsequently begin engaging in public sex together, embracing the associated risks to enhance their intimacy.

As their relationship progresses, Yonezu pushes for further exploration, specifically demanding to witness her urinate for him. Despite their shared public acts, Hina refuses this particular demand, establishing a clear boundary. This refusal creates tension as Yonezu seeks to escalate activities to fulfill his own fantasies, often pressuring her beyond her comfort level.

Their dynamic evolves into increasingly risky scenarios involving sex toys and attempts at public urination near residential areas. These developments lead to situations where Hina faces coercion into acts against her will, marking a shift from mutual exploration towards pressure and control.