Manami Tachibana has been married for 15 years, living happily with her Canadian husband, who works at a foreign securities firm, and their half-Japanese son. Her husband is well-built, highly successful, and their son is adorable—on the surface, it's a marriage others envy. However, being a devout Christian, her husband only permits sex for procreation, forbidding any other sexual activity. As a result, Manami has gone without sex for 15 years, resorting each night to satisfying herself with her favorite vibrator. Over time, her sexual frustration grew unbearable, pushing her to the limit. Now, with her husband away on a business trip to the Canadian headquarters, Manami sees this as the perfect opportunity for a daring new experience.