Sakurako Suouin wants nothing more than her father's approval. The elegant girl is the object of envy at her school, winning equestrian tournaments and achieving perfect grades. However, her life takes a turn for the worst when she finds out that her father's company is nearing bankruptcy. Willing to help him at any cost, Sakurako decides to seek the aid of her trustworthy school principal. He agrees to help, but requires that Sakurako fulfill one condition: she must sell her beautiful body to wealthy bidders in an underground auction hidden beneath the school. With no other alternative, Sakurako accepts the offer and begins her time in a world of debauchery and lust.