Ai is a married woman who wants a child. On her ovulation day, when the chances of pregnancy start to rise, she receives a letter. "Congratulations on your pregnancy." A masked man suddenly appears, pins Ai down, and thrusts his erect penis deep into her vagina, pouring his semen into her. Unbeknownst to her, Ai's entire life is being watched by a surveillance camera. Without her even realizing it, her body begins to react to the repeated ejaculations of the rapist. Before long, the married woman is pregnant with a child unknown to anyone...