Unsatisfied with her married life and growing emotionally distant from her husband, Akiko decides to file for divorce. She confides in her son, Shinsuke, but he opposes the separation, unable to understand why his parents would break up. One day, Shinsuke's father asks him about the real reason behind the divorce, revealing it's due to a lack of sex. Upon learning this shocking truth, what will Shinsuke do next?