I was going to take the university entrance exam in Tokyo, so I decided to stay with my uncle who lives in the city for a while. His wife, Mako, graduated from a famous women's university and was going to help me with my studies. However, when I saw Mako's sophisticated sex appeal and the sight of her having sex with my uncle in high-class lingerie, I, a country boy who is still a virgin, was unable to concentrate on my studies. Then, Mako came close to me and put her lips to mine, saying, "You saw it yesterday, didn't you?"