Her only son has been hospitalized at a university hospital in Tokyo due to a terminal illness, and the cost of the required surgery is astronomical—far beyond what her family can afford. In this desperate situation, a wealthy man named Yanagi offers to cover the entire medical expense. However, his condition is that he wants to hire her as a sex slave for one year. Facing utter despair, the family cannot afford to let this opportunity slip away and ultimately agrees to his terms.