Asami is a wife living with her husband and father-in-law. Her husband is always tired, and her father-in-law is unsociable. Her brother-in-law, Keiichi, brightens up her gloomy life. He's a playboy, but to Asami, he's an exciting man. Before she knew it, Asami was hooked by her brother-in-law's eloquence and gave in to his body. She discovered the joy of sex and became obsessed with it, but one day, her father-in-law saw her.