Riku-chan is a sporty girl who belongs to the girls' soccer club. She hasn't had a boyfriend for two years and has been completely estranged from sex. However, it's not easy to suppress the sexual desires of adolescence. Riku-chan, who has let her inhibitions go, is a smooth talker who says she's doing it for the sake of a 10,000 yen bill. In reality, she is looking for pleasure and accepts the raw dick of a man who is more than 20 years younger than her.