Minami Nagareda, a shocking retirement work! Minami, a mother who goes to take care of her son who came to Tokyo once a month. However, as she goes there repeatedly, her feelings for her child eventually change into feelings for the opposite sex, and they end up having intercourse. Such a rotten relationship can't last long. Minami, who decided to withdraw thinking about her son's future. "Actually, I still love him... I don't want to break up. But..." This will be the last time――. In order to cut off her regrets and take responsibility as a mother, she goes to see her son...