Shinichi is a salaried man in his forties with a wife and children, but he had been conscious of his own mother as a woman. One day, in a place where there were no family members, he confessed to his mother and tried to pin her down. She initially refused, but after being asked repeatedly, she said 'Just this once...' so the two of them secretly went on a trip. Today's promise... To help her son, she told herself this, but her body craved the man. What was supposed to be just one time turned into indulging in pleasure and repeating the act over and over...
