在这部十七岁的夏天片中,A Side 的故事中，陳甜（江玲飾）剛剛完成會考，正計劃到北京升學。臨別前，她跟好友相約到長洲度假，嘻嘻哈哈，齊齊睇三級片齊齊在長洲的陽光下跑跳碰。在那裡，她更初嚐戀愛滋味。縱然這段關係無聲地結束，卻已叫她繾綣回味。
B Side的阿妹（陳倩文），失意於大城市，於是重回自己成長的長洲，再遇青梅竹馬長大的兩個男孩。當熾熱的陽光灑落在他們赤條條的肌膚上，他們驚覺自己不再是昔日的小孩子，三人的關係亦起了變化。
Chen Tian is a schoolgirl in Hong Kong about to leave for Beijing for college. Before she leaves for good, she decides to spend an unforgettable trip with her best friends in a distant fishing village. There she discovers love for the first time. The encounter ever so brief, but has left something she can take away with her forever. At the same fishing village, Ah Mei, a girl who's had a tough time in the big city, comes back home to the village to revisit her past. She finds herself reuniting with two boys from her childhood. But time has quietly tarnished their friendship, without them ever aware of the innocence lost.
十七歲的夏天---藍色校裙下的青春回憶。
