Miki had been feeling suffocated by her husband's control... They had been married for 12 years, hadn't been blessed with children, but had lived a relatively happy life as a couple. However, her husband, who had been accumulating stress from a promotion battle at work for about five years, had gradually started to control Miki. As a result, Miki was forced to quit her job and become a full-time housewife. She was even forbidden to go out, and her only respite was to go out during her husband's workday. One day, while confiding in a junior about her marital woes, Miki's true feelings were brought to light. She admitted to feeling stressed by her husband's control, but didn't want a divorce... But if things continued like this, she felt she'd suffocate. That's right... Miki had been craving "convenient fun." Around that time, Miki learned that there were more and more women who had a desire to be bound. Encouraged by her junior, and despite the pangs of guilt, Miki took a step into this unknown world. There, a new world awaited Miki... As Miki, who had been tormented by restraint, was bound, she unleashed her unknown sexuality.