Minami Nagare, the shocking retirement work! Once a month, Minami, a mother who goes to Tokyo to take care of her son, finds her feelings for her child gradually changing into romantic emotions towards an opposite sex, leading to an intimate relationship. Such a decadent relationship cannot last long. Thinking of her son's future, Minami decides to withdraw. "I really still like you... I don't want to break up. But..." This is the end—. To cut off her lingering feelings and take responsibility as a mother, she goes to meet her son...