Meguri, dreaming of a luxurious lifestyle, marries a divorced doctor with a child. However, she grows increasingly frustrated and troubled by her stingy husband and her stepson's cold attitude, living each day filled with dissatisfaction and confusion. Amid this turmoil, Meguri secretly invites an old friend—a married man—into her home, hiding her own marital status as they indulge in an affair. Unbeknownst to her, the man records their sexual encounter with a video camera, and this act casts a dark shadow over Meguri's life, triggering irreversible consequences. Ultimately, Meguri is forced into a life of servitude under her stepson. "The greatest mistake of my life... was giving in to my desires..."