Married for 12 years, Sumire once found happiness in her quiet life with her husband. But a few years ago, after failing to get a promotion at work, her husband began accumulating stress. Gradually, he started controlling her—forcing her to quit her job, turning her into a full-time housewife, and restricting her outings. The only time she could breathe freely was during the day when he went to work. One day, she opened up to her junior colleague about her struggles, and her true feelings surfaced. While she didn't want a divorce, she felt suffocated by her husband's control. What she truly desired was something different. That's when her junior told her about a growing number of women who secretly longed to be tied up. Torn between guilt and anxiety, yet encouraged by her junior, Sumire stepped into an unknown world—one that held the new possibilities she had been searching for. The woman who once suffered under bondage would now awaken to a new realm of pleasure by willingly being tied up.