「我看似容易被追到手，卻對感情要求嚴苛。
我要求全心全意，對方也得是。」
夏天的布列塔尼海灘，賈斯柏遲遲等不到夢中情人蕾娜，卻邂逅了餐廳服務生瑪戈。和主修人類學、幽默風趣的瑪戈相處，讓賈斯柏感到前所未有的放鬆，兩人漸漸發展出「朋友以上，戀人未滿」的關係。賈斯柏在另一個派對上認識了當地辣妹蘇蓮，熱情如火的蘇蓮擁有最完美的「夏日戀人」條件，讓賈斯柏深深著迷，然而看似豪放不羈的蘇蓮，卻對感情有著嚴苛的原則，每次親熱到最後一道防線前，總會臨陣喊「卡」，讓賈斯柏無法摸透。就這樣，賈斯柏周旋在兩個女孩之間搖擺不定，就在他好不容易下定決心時，消失許久的蕾娜居然也來到布列塔尼，讓賈斯柏不安定的心再次動搖了……。

Gaspard (Melvil Poupaud), a recent university graduate, arrives at the seaside in Bretagne for three weeks' vacation before starting a new job. He's hoping his sort-of girlfriend, the fickle Lena (Aurelia Nolin), will join him there; but as the days pass, he welcomes the interest of Margot (Amanda Langlet, the titular character from Rohmer's PAULINE AT THE BEACH), a student of ethnology working as a waitress for the summer. Things start to get complicated when the spoken-for Margot encourages Gaspard to have a summer romance with her friend, Solene (Gwenaelle Simon), and he complies. When Lena turns up, and scheduling complications abound, Gaspard will have to make a choice...