夜子（深田恭子饰）对平凡无聊的日常生活感到非常不满，一心想要寻找自我，以充满Fighting Spirit斗阵精神的生活态度向前迈进。就在小夜子19岁那年夏天，遇见了来自韩国的留学生亚美（尹孙河饰），两个文化背景完全不同的女孩，由冲突中激发出亮丽耀眼的火花！小夜子并从中渐渐了解何谓坚强，与自己未来的方向……

Sayoko is a tough, 19-year-old with ambition, energy and nowhere to direct it. Her father clearly favors her blind 16-year-old sister. Junior college is unstimulating. She is fired from her part-time job in a dress shop because she is too diligent at catching shoplifters and slaps them around a bit when she does. Even her boyfriend opts out for a more docile girl, but Sayoko doesn't think she is tough enough.