Mara (Campbell), a young professor struggling through marriage, only to meet Matt (Johnson), a man from her past who wanders onto her university campus.
An unadorned perspective on impoverished life in Okinawa. 17-year-old Aoi works as a nightclub hostess in order to earn rent money and to provide for her little boy and his lazy father, who has no qualms about hitting his wife. Yet how dark does reality have to get before it stifles the rays of hope that filter through?
2007年躁動不安的暑假,熱愛游泳的13歲女孩隨母親搬到鄉下外婆家,在游泳館邂逅了小她一歲、擁有過人天賦的謎漾男孩。女孩活躍直率,男孩內斂溫吞,男孩在一場海邊的溺水意外救了女孩,也就此寫下兩人的難解緣分。她追著他打鬧嬉戲,他和她分享專屬秘密,直到高中升學之際,少年為了追逐游泳夢離開小鎮,因此失聯。2014年他們重逢之際,一個迷失於游泳訓練,一個深困於自卑心結,相望相知的彼此,能否再續前緣?