A man and a woman who seem to be childhood friends. The man has become a bit of a playboy since his high school debut, while the woman, who is still not very sophisticated, comes to him for advice, saying, "I got a boyfriend, but sex isn't going well." However, the man who always boasted about being popular with girls is actually a virgin, and instead of teaching her, they end up practicing sex together. However, he is so bad at it that she ends up accidentally cumming inside him...!