Ranma, in female form, walking to school with Akane reads a challenge he received earlier when he gets attacked by someone in a postbox. after knocking them down, and they getting hit with a telephone pole, the person emerges as a girl. the girl named Tsubasa Kurenai is challengeing Ranma for Ukyo's affections, after she was rejected by her, and was shown a picture of female Ranma.
Ranma's bunnygirl disguise.
Ranma and Tsubasa compete by trying to sell the most okonomiyaki. initially, Tsubasa blows away Ranma, selling all of hers without Ranma getting a single sale. however, Ranma uses a bunnysuit disguise, and sells all but one until Akane drags him away. as he muses on falling short, Tsubasa, in disguise, declares herself the winner, until Ukyo decides to buy Ranma's last okonomiyaki, thus tying procedings. Tsubasa, dejected even after winning, runs away in tears declaring that she will leave Ukyo alone.