In their modest, cramped apartment, Miyuki Umino's older brother enthusiastically discusses the new business venture he's launching, vowing to achieve great success and lift his family out of poverty. Months pass, and Miyuki is confronted by creditors linked to the yakuza. They inform her of her brother's disappearance and a defaulted loan of 250 million yen. With her brother nowhere to be found, Miyuki is now responsible for this debt. The creditors present her with an option: repay the loan by working in a soapland.
Desperately seeking an alternative to prostitution, Miyuki stumbles upon an article about the reigning women's tennis champion, who earned 250 million yen within a year. Having once been a promising tennis player, Miyuki decides to leave school and pursue a professional tennis career to pay off her debt. However, the organization that previously excluded her from the tennis world has not forgotten or forgiven her. Can Miyuki thrive in a highly competitive environment that actively works against her?
[Written by MAL Rewrite]