Rika, a single mother in her forties, decided to work as a temp to support her son's study abroad. One day, while working late, the president said to her, "I'll make you a full-time employee," and forcibly raped her. Her son happened to be there to pick her up, and when he tried to open the office door, he heard his mother's moans… Upon returning home, her son berated her, but in the struggle, they ended up having sex. The "woman" inside the mother awoke, becoming addicted to sex and transforming. Thus, they fell into incestuous mother-son relations.
