Mitsui Hikari plays a wife who makes a shocking confession about being seduced by her husband's younger brother, the second son. Her brother-in-law has returned to take over the family farm. The wife's body is instinctively drawn to his youthful appearance and his extraordinarily large penis. In between farm work, they have a secret affair in the barn. Amid the smell of earth and sweat, her body is penetrated by her brother-in-law's huge penis, and she lets out a lustful cry that she would never let her husband hear. Though she feels guilty towards her brother, she cannot escape the overwhelming pleasure of his huge penis. This is a story of immorality in which the chains of family are torn apart by the joy of seducing someone.