Reiko, who married a man with a child from a previous marriage, had a problem. She suddenly found it difficult to open up to her new son. The person she wanted to talk to the most at a time like this was her husband, who was extremely busy with work and unable to be with her. To add insult to injury, Reiko masturbates out of loneliness and anxiety, and then tragedy strikes. Her son sees her in the act. The son, who already thought that he had been chased away by his mother, is furious at Reiko's impure actions and decides to take revenge...