Widow Midori masturbates in front of her grandson on the third anniversary of her husband's death. When her grandson notices and confronts her, Midori lies and says he's mistaken. However, his erect cock is clearly visible, and Midori takes pleasure in the sight. Craving a new kind of pleasure she's never experienced before, she gives in to desire and lets her grandson penetrate her with his young, firm cock, reaching climax. Once she tastes it, she can't stop craving it. Whether in the bath or in the quiet of night, the lustful bond between them never breaks. This film delivers taboo, incestuous sex that crosses the line of familial boundaries.