Gaby owns a farm on which he raises lambs: Bouchard & Sons Farm. But he has no sons. Rather, he has two daughters that he raised like princesses and who live far away, in the big city. One day, the oldest asks him for some financial support so she doesn't end up losing her house. Gaby, for whom fatherhood has evolved to a point where it became unreasonable, decides to dismantle...

故事讲述大战末期，十四岁的哥哥和四岁的妹妹在空袭中失去了母亲，而当地政府为了强迫人民节省战争下剩余的物资，对他们实施严厉的管制，哥哥和妹妹两人都不愿意在这种管制下生活，两兄妹遂以洞穴为家，没有大人帮助他们，要自行找寻食物维生，生活刻苦之余，他们也像其他小孩一样活泼好动，闲来在杂乱下的田间玩乐，夜晚更一起在草地上观看漫天飞舞的萤火虫。可是快乐的日子不长，最后妹妹因身体衰弱而死…