After 11 years of marriage, Kaede Sakuma had built a modestly happy life with her husband, though they never had children. But several years ago, her husband began suffering stress from corporate promotion struggles, gradually turning controlling and possessive. As a result, he forced her to quit her job, making her a full-time housewife. He restricted her from going out, leaving her only brief moments of freedom during the day when he was at work. One day, while confiding in a junior colleague about her marital struggles, she was introduced to a certain website. Though she felt immense stress from her husband's control, divorce wasn't something she wanted. Yet, continuing like this felt suffocating. That's when Kaede began seeking an escape—an affair of convenience. Around this time, she learned about a growing number of women who secretly desired to be tied up. Encouraged by her junior colleague and overwhelmed by a deep sense of taboo, she took her first step into an unknown world. There, she discovered a new reality she never imagined. Kaede, who had suffered under emotional bondage, finally experienced a new sexual liberation through physical restraint.