Married for one, then two years, the relationship between husband and wife grew cold, and romantic feelings had completely faded away. Amidst this emptiness, Kasumi found herself feeling increasingly lonely. One day, she visited her coworker Kazuya's house—and suddenly, he confessed his feelings to her. Torn between the sincerity of his emotions and the guilt of betraying her husband, her heart wavered. Despite the loyalty she had built with her spouse, she gradually gave in and opened her body to him.