The Windas, now in their third year of marriage. Initially, they had been passionately in love, but recently their sex life had become routine. To improve this situation, the husband prepared a vibrator, but his wife Yumi scolded him harshly for relying on a tool and put it away in the cabinet. One day, Yumi, who is fluent in English as a returnee from overseas, was asked by her nephew Shunzo to teach him English conversation. A few days later, when Shunzo came to their house to start his English lessons, he accidentally found the vibrator that had been put away in the cabinet…
