小男孩一到學校便將書包丟到小女孩的桌上，小女孩非常不高興，但小男孩還是故意去鬧她，於是小女孩便在兩人的桌上中間畫了一條線，不准小男孩越線，當小男孩正因上課的無趣而打起瞌睡時，他沒注意到他的衣袖越線了，小女孩竟拿起剪刀將超出的衣袖剪掉…，兩個小朋友的戰爭就此展開！本片採用立體偶動畫做為創作媒材，以充滿童趣與溫馨的故事細膩描述著孩童間天真的小小征戰。

There were some children in the classroom.The boy, his satchel put down on the table in front of the girl. The girl quarrels with the boy, but he always bothers her. The girl and the boy draw a line on the table respectively.When they sleep, the boy doesn’t notice his sleeve crossing the line. So the girl cuts it off……The boy is very angry. And the war starts just now!