Misuzu Akino is 45 years old and a single mother. Her son Akira, raised without a father, had always been overly affectionate toward her, which had become a source of concern. However, that affection gradually evolved into intense romantic desire. Because she cherished him deeply, she honestly accepted those feelings. And tonight, Akira comes to her bedroom once again, his penis erect, beginning a new chapter of their forbidden intimacy.