Young farmer Osamu, toiling in the fields, constantly wiped sweat as he gazed up at the sky. In his heart burned a long-held longing—for his beautiful, elegant aunt Sumire. In his memories lingered a dreamlike scene he once witnessed: Sumire, pressed against the edge of the field, passionately kissed from behind as her breasts were groped. Just as that vision resurfaced, Sumire suddenly sent him a letter—filled with words that stirred his soul.