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The Kazama couple has been married for three years. At the beginning of the marriage, they loved each other intensely, but recently their sex life has become a rut. My husband prepares a vibe to improve it, but my wife Yumi scolds her husband who tries to rely on tools and puts it away in the cupboard. One day, Yumi, a returnee and fluent in English, asked her nephew Toshio to teach her English conversation. A few days later, Toshio visits her house and immediately starts studying English conversation, but by chance, Toshio finds a vibrator that has been put away in the cupboard.