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Maki lives with her husband and his brother-in-law, Tsuyoshi. One day, Tsuyoshi seduces her, and her body becomes his obedient toy, unable to resist. While they are having dinner together, she sneaks away from her husband and plays with him with a vibrator, and while he sleeps next to her, she indulges in thrilling sex... Furthermore, Tsuyoshi's friends join in and they writhe in endless orgies.