One day, after her husband suddenly went missing, her son Makoto asked her, "Are you lonely?" But she wasn't lonely at all. That's because, in addition to her sweet and dependable son Makoto, she had a lover who fulfilled her emotionally and physically—someone who excited her far more than her husband ever did, awakening her as a lustful woman. In truth, she loved this lover more than her husband. Then, one day, a forbidden secret surpassing even him was discovered hidden in an unexpected place...