Rina, who has been married to her Russian husband for three years, once imagined a happy married life. However, she becomes entangled in Russia's vastly different infidelity culture, contrasting sharply with that of Japan. As she struggles under her husband's belief in romantic supremacy, Rina gradually adapts to Russian customs in an effort to maintain harmony in their marriage. Through this process, her sense of fidelity slowly begins to shift. Eventually, she awakens to the adult pleasure of extramarital affairs and becomes completely captivated by this new lifestyle.