Saki and her son Shingo do not get along well, and their relationship has deteriorated to the point where they insult each other whenever they meet. On this day, they continue to insult each other, and Saki calls Shingo "not popular," a word that has worried him. Shingo's pride is violated, and he explodes with anger. He fights back with his strength. He tries to resist, but Saki's strength is no match for a young man... Saki is forced to perform sexual services for her son, a humiliating treatment.