Since divorcing her husband, Nanako has been raising her two sons on her own. Her sons are like treasures to Nanako. One day, while Nanako was comforting her second son, Jiro, who had been made to cry by their eldest son, Taro, after a fight, Jiro suddenly stopped crying and made a lewd request: "Mom, can I suck your breast?" Nanako, who loves her sons so much, is unable to refuse Jiro...