日本电影《夏之妹》由大岛渚导演，佐佐木守、大岛渚和田村孟共同编剧，栗田裕美、小松方正、镰田小惠子、小山明子、石桥正次、佐藤庆、殿山泰司和户浦六宏主演。该片是一部剧情电影，讲述了素直子收到一封来自冲绳的来信，信中自称可能是她的异母哥哥大村鹤男。素直子和父亲的未婚妻桃子一起前往冲绳旅行，希望能找到哥哥的踪迹。然而，鹤男曾经见过桃子并将其误认为妹妹，对素直子却没有太多感情。桃子背叛了未婚夫与鹤男开始了一段恋情。在冲绳，素直子偶然结识了国吉，他也有可能是大村鹤男的父亲。国吉与素直子的父亲菊地是大学同学，但鹤男不知道他们谁是自己的亲生父亲。过去曾对立的国吉和菊地如今已成为冲绳和东京的社会精英，对于这些过去的纠葛，他们选择以笑容一笑，这或许是他们最适合的态度。在这个血缘故事中，冲绳与日本的关系得到了隐喻性的反映

《夏之妹》通过展示素直子寻找亲人和面对复杂情感的旅程，探索了血缘和情感之间的纠葛。素直子对于自己的家庭背景和亲人的寻找充满了渴望和困惑。她与桃子、大村鹤男和国吉之间的关系逐渐交织，揭示出家庭、爱情和身份认同的复杂性。冲绳与日本的关系也在这个故事中得到了象征性的体现，呼应着人们对于根源、身份认同和文化传承的思考。

The Japanese film "Natsu no Sister" is directed by Nagisa Oshima, co-written by Mamoru Sasaki, Nagisa Oshima, and Meng Tamura, Hiromi Kurita, Founder Komatsu, Starring Kamada Koeko, Koyama Akiko, Ishibashi Shoji, Sato Kei, Tonoyama Taiji and Toura Rokuhiro. The film is a drama film about So Naoko receiving a letter from Okinawa claiming to be her half-brother Tsuruo Omura. Su Naoko travels to Okinawa with her father's fiancée Momoko, hoping to find her brother's trace. However, Tsuruo had seen Taozi and mistook her for his younger sister, but he didn't have much affection for So Naoko. Tao Zi betrayed her fiancé and started a relationship with Tsuru Nan. In Okinawa, Naoko met Kunikichi by chance, who may also be Omura Tsuruo's father. Kuniyoshi and Su Naoko's father, Kikuchi, are college classmates, but Tsuruo doesn't know which of them is his real father. Kuniyoshi and Kikuchi, who used to be at odds, have now become the social elites of Okinawa and Tokyo. Regarding these past entanglements, they choose to smile, which may be their most suitable attitude. Okinawa's relationship with Japan is metaphorically reflected in this blood story

"Sister of Summer" explores the relationship between blood and emotion by showing Naoko's journey of finding her loved ones and facing complex emotions. entanglement. Su Zhizi is full of longing and confusion about her family background and the search for her relatives. Her relationships with Momoko, Omura Tsuruo, and Kuniyoshi gradually intertwine, revealing the complexities of family, love, and identity. The relationship between Okinawa and Japan is also symbolically reflected in this story, echoing people's thinking about roots, identity and cultural heritage.