Naho Hazuki is a woman in a loveless marriage marked by a large age gap, left sexually frustrated and emotionally drained. One day, her daughter and son-in-law visit her home. The son-in-law, raised in a single-mother household and deeply attached to women of maternal nature, finds himself drawn to the gentle and composed Naho, increasingly aware of her voluptuous figure. That night, after Naho collapses from heavy drinking, her son-in-law tends to her. Seeing her defenseless body awakens uncontrollable desire within him, and his suppressed passion begins to erupt.