One year has passed since I lost my husband, and my daughter Riko has started living with her husband Hisashi. In our daily life together, I often overhear the sweet sounds of Riko and Hisashi's intimate moments, and my heart begins to tremble with emotion. Stimulated by those sounds, I find myself masturbating more frequently. Unaware that Hisashi knows about it, I continue living through these emotionally turbulent days. One night, Hisashi suddenly appears and wraps his arms around me from behind, holding me tightly. Surprised by his sudden advance, I try to resist, yet I feel my heart swaying under the warmth of his embrace. Since then, even when Riko is nearby, Hisashi keeps seeking me out. A new relationship begins to blossom, and once again, my heart is thrown into turmoil.