Nanako, a wife who has been feeling lonely since her older husband passed away. Worried about her, her husband's three brothers come to visit her. Nanako begins to let her guard down as they gently comfort her, but... one night, her husband's younger brother, Tetsuya, attacks Nanako as she sleeps in her bedroom. Although they are her husband's brothers, they are middle-aged men with a lot of potential. Their real purpose in coming is to get the fortune of the wife left behind and Nanako's ripe body. Nanako is then violated one after the other by these hungry middle-aged men...