罔广就读于有网球王国之称的县立西高中一年级，是个有点追星族风格的马大哈女生，她因为憧憬成为外号“蝴蝶夫人”的一流高中网球选手龟崎丽香加入了著名的网球俱乐部，被鬼教练宗方仁指名参加地区大会。小广面对前辈和同时入社的嫉妒感到非常困惑，但是她在闺蜜爱川maki、男球手藤堂贵之、经常去的汉堡店的店员替补队员的鼓励下逐渐显现了宗方所看出的潜力。在宗方的高压政策下，单纯善良的小广不仅增强了实力，也逐渐地成长起来。小广不仅和憧憬的“蝴蝶夫人”在同一片场地并肩战斗，不知何时她们也成为了站在球网两边的对手。

Heroine, Hiromi Oka, has just entered a high school famous for its tennis club. She has started playing tennis yearning after Madam Butterfly. She was expecting to enjoy playing tennis with her best friend, Maki, but the situation changes when the new coach, Mr. Munakata, suddenly picks out Hiromi to be one of the players for the upcoming tournament and starts giving Hiromi tough lessons. She strives under any circumstance. The more the new coach gives her training, the better she seems to get. Finally she becomes the representative in the junior match tournament.

高校テニス界の名門・西高1年の岡ひろみは、お蝶夫人こと竜崎麗香に憧れ親友の愛川マキとともにテニス部に入部する。新任の宗方コーチの過酷な練習内容に反感を隠さないひろみ。だが宗方は地区大会の代表メンバーに初心者のひろみを指名する。上級生らの妬み、そして鬼コーチの猛特訓に持ち前の粘り強さで耐えながらひろみは着々と実力を伸ばしていくが……。