I was going to take my university entrance exams in Tokyo, so I ended up staying with my uncle, who lives in the city, for a while. His wife, Mako, graduated from a famous women's university, so she agreed to help me with my studies. However, seeing Mako's sophisticated sex appeal and the sight of her having sex with my uncle in her luxurious lingerie, I, a country boy and still a virgin, couldn't concentrate on my studies. Then, Mako came close to me and leaned her lips against mine, saying, "You saw it yesterday, didn't you?"