Risa is from a rich family. However, his parents suddenly declare bankruptcy and she can't pay the rent of her apartment. She starts working as a race queen and meets Ukyo, a racer. Ukyo hears her trouble and pays the rent for her. To repay it, Risa gives him Paizuri.... Like this, she gradually falls in love with Ukyo....

[Edited from ErogeShop.com]