Married for 17 years, Rie has lived a modestly happy life with her husband, though they were never blessed with children. But a few years ago, her husband began suffering stress from his corporate promotion, gradually becoming controlling toward Rie. Because of this, she was forced to quit her job and become a full-time housewife. Going out was strictly forbidden—her only relief being secret outings during the day while her husband was at work. One day, while confiding about her domestic struggles, a junior colleague introduces her to a certain website. Feeling suffocated by her husband's control but unwilling to divorce, Rie finds herself desperate for an escape. That's when she learns about the growing number of women who secretly desire to be tied up. Encouraged by her colleague and overwhelmed by a sense of taboo, Rie takes her first step into an unknown world. There, she discovers new excitement and liberation. A woman once tormented by bondage finds herself awakening to new sexual possibilities through being restrained. This single step becomes a major turning point in her life.