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. Her husband prepares a vibe to improve it, but her wife Yumi scolds her husband who tries to rely on her tools and puts it away in her cupboard. One day, her nephew Toshio asked Yumi, who is a returnee and is fluent in English, 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.
