十八岁的天空

在面對愛人情感不貞問題的激烈鬥爭中，發生了一場可怕的誤會，使得兩個最好的同志姊妹，彼此疏遠了很多年。 十年後，這對姊妹因姊姊不幸的重病而重新團聚。她們在談論未來時，不斷地回想起了過去種種。 雖然，他們很喜歡彼此的成長及改變，但在未實現的夢想中，可以明顯感受到學融（姊姊）不安且緊張的情緒，以及對美好生活藍圖的絕望。 當知道他們剩下在一起的日子愈來愈少，這對親親壞姊妹安排了人生最大之冒險旅程，希望在失去最愛的姊妹之前，能夠留下彼此最美好的回憶。 一路上，他們更加體悟了生活親情、愛情、和彼此友誼的重要性。他們彼此信守諾言，讓學融未完成的夢想成真！

一名来自美国中部的年轻人的冒险经历和他在一战服役的经历

Aspiring to be admitted to a good university and to become a lawyer, Tasiro Yuusuke, a tenth-grader from Kyushu, enrols in a prestigious high school in Tokyo. Plans are made for him to live in his uncle's house, part of which is rented out while his uncle is abroad on business. A realtor's mistakes leaves Tasiro sharing the house with Kei Yamaba, the most beautiful girl in the school, who is also his classmate. There is the risk that their unexpected 'co-habitation' will be discovered by the school authorities. While he grows increasingly attracted to her, he is often irritated by her innocent and nonchalant attitude towards their predicament. They each develop other romantic attachments, but end up turning to each other.

本片改编自川端康成著名小说《伊豆的舞女》。即将就读东京某高等学校的川岛（三浦友和）趁开学前的暑假前往伊豆旅行，在乍晴乍雨的山道上，他遇到一群巡回卖艺的歌舞伎艺人，因被其中一个梳着古代发髻、背着大鼓的娇小玲珑舞娘吸引，他决定与他们一起上路，路上，他得知该舞娘叫熏（山口百惠）。川岛不计歌舞伎艺人地位卑微，常邀请他们到他住的旅馆玩耍，而在和熏有过单独相处后，他更被其纯洁无瑕的美震撼，陷入矛盾中，一面为自己难以抑制的冲动而苦恼，一面为她在表演时可能受到侮辱惴惴不安。熏在两人的交往中，也渐渐生出真情。可是两人也只能是彼此生命中的过客。