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My mother, Yumi, and my son, Tatsuya, have a physical relationship because of my father, Koichi's business trip! One day, when I came home from Koichi to the two who were searching for each other, I received a phone call. If you don't stop the act immediately, it should be dangerous, but the last-minute immoral act brings pleasure that you have never got before and you can not stop it. Will the two people, who are becoming more and more fierce and seeking each other, be able to safely return home to Koichi?