Ayumi married a divorced man twice her age who had children. She was living a happy married life, but there was one thing that worried her. It was about her stepson, Kodai. He was going through a rebellious phase, dropped out of school, and was drifting around without a steady job. She thought she had to step up as a mother... But now, a young and beautiful woman, closer in age to her father, has come to her house, which had been devoid of women, and she has been meddling and even lecturing her, which has caused her frustration and sexual desire to explode...