Risa, a wife, was visiting her husband. Her father-in-law, who she hates and is a sexual harasser, risked his life to protect her from a falling dresser... This triggered her to Kokoro to him, but he knew this and started to tease her with sticky kisses and caresses, trying to get into the gaps in Kokoro. Then, as his body crawled close to her, he took away Risa's escape route, and the two of them became embroiled in an immoral, intimate affair...