A hidden camera recording of a consanguineous incest scheme orchestrated by Koichi Takahashi. To fulfill the desire that arose between an older sister and her younger brother, the brother commissioned this project. The sister, a divorced woman living with her brother, agreed to appear as a nude model to cover up her brother's work mistake. Director Takahashi, disguised as a painter, gives instructions, leaving the sister confused. As her wet vagina is exposed, the commands grow increasingly lewd. The brother then inserts his penis, bringing her to multiple climaxes. Later, during a modeling session where the sister appears blindfolded and naked, the brother enters the room. Unaware of the situation, the sister gets intimate with him, moaning passionately on camera. Upon realizing it's her brother, she screams, causing the plan to fail. After persuasion, she agrees to allow it just once—this time in the cowgirl position, frigging his penis. As the brother thrusts vigorously, she reaches climax repeatedly, creating an erotic and shocking scene.