"Marriage... is completely different from romance." 28-year-old Yuriko, gentle and smiling, fully embodies the charm of a married woman. Her monthly four-times-a-month sex life with her husband feels like nothing more than the fulfillment of his selfish desires, leaving her feeling deep despair inside. What does marriage truly mean? What is happiness? On a long-awaited date with a man other than her husband, her heart flutters again with feelings of love. As time passes, their relationship grows deeper—and increasingly bittersweet.