The story follows a teenage heroine who embarks on a career as a professional tennis player to repay an enormous debt incurred by her brother to yakuza loan sharks, with the threat that if she fails, they will force her into a life of prostitution at a soapland.

One day, she receives a visit from two yakuza who ask her to reimburse a debt of 250 million yen contracted by her older brother, of whom she has no news.

To escape prostitution, she left high school and decided to start a career as a professional tennis player.

Gifted in this discipline, she has already won many prizes, however now she must excel and win the biggest championships in order to quickly repay her creditor who would prefer to see her on the sidewalk.

Urasawa's "most depressing manga ever" and wrote that it "strikes a middle-ground between the author's more conventional earlier work and the character studies that would come to define his greatest projects".