Eight years into marriage, Takunori quit his office job to focus on stock trading from home. Intimacy between him and his wife had long disappeared, and daily life had settled into monotony. One day, everything changed when his wife invited her friend Saiko over. Despite her seemingly pure and innocent appearance, Saiko subtly exuded masochistic tendencies. She began visiting the Yatsuhashi household more frequently, and Takunori gradually developed a new fascination with her. Taking advantage of moments when his wife was away, he repeatedly overpowered and forcibly pinned her down. Drawn to her helpless demeanor and captivated by her mysterious allure, Takunori's desires deepen, driving the story into darker, more intense territory.