Nakasaki Yukine is a married woman who, after three years of marriage, left her job as an insurance saleswoman to fulfill her long-held dream of becoming a full-time housewife. However, she gradually finds herself trapped in an unexpectedly dull and monotonous daily routine. Trying to distract herself by occasionally going out to eat or shopping with friends, she ends up beginning a relationship with another man during a usual drinking party. As her involvement with this man deepens, she struggles with growing guilt over betraying her marriage, yet finds her desires impossible to suppress. Her inner conflict and emotional turmoil add depth to the story.