Forbidden mother-son incestuous love! Exclusively starring Kimura Rei in her first live-action film! Natsumi, a full-time housewife, has not had sex with her husband for some time, but she convinces herself that it's normal since she's getting older. However... one day, her only son, Takuya, who is preparing for entrance exams, begs her, saying, "I can't stop seeing you as a woman, and I can't concentrate on my exams! So let me have sex with you!" Natsumi naturally rejects his request, but Takashi's persistent pleas and the carnal desires welling up inside her push her to cross the line...