Recently, Sakamoto's relationship with his girlfriend has not been going well, and he is afraid that their engagement will be called off. One day, Sakamoto goes to his aunt for advice. The aunt believes that the cause of their discord is Sakamoto's selfish sex habits, and decides to use her own body to teach her nephew the art of sex. I'll teach you about sex! The aunt he secretly admires will teach him directly about the wonders of women. Her voluptuous breasts, her ass, and her vagina...!