Miwa appears to others as a gentle, virtuous wife and an ordinary housewife. However, she harbors a secret that no one knows—engaging in a forbidden intimate relationship with her own son behind her husband's back. Though she knew it was wrong, she could no longer resist the daily temptations of desire and continued to yield to her son's advances. Their bond grew deeper, escalating to the point where they passionately sought each other every time her husband left the house. Dominated by lust, her heart had already ventured onto a path from which there was no return.