Sumire Kuramoto, who got married just last year. She had imagined a dreamlike married life, but reality turned out to be surprisingly dull. Her husband's cold attitude made meals nearly silent, and on weekends he would immerse himself alone in his hobbies. Their intimate moments had become nothing more than a mechanical fulfillment of sexual needs, lacking any sense of love or affection. As this situation continued, dissatisfaction built up inside her, and eventually the desire for an affair began to stir.