十年前，竹内亮导演在NHK拍摄纪录片《长江天地大纪行》时留下了一个遗憾：未能拍摄到“长江源头的第一滴水”。十年后，迁居中国南京的他决心弥补这一遗憾。经过两年的精心准备，他在2021年再次踏上了6300公里的长江之旅，与旧友们重逢。竹内亮的镜头下，不仅有壮美的自然风光，更有普通百姓的朴实笑容和令人潸然泪下的动人故事。他捕捉了长江沿岸的风土人情和百姓的真实生活，展现了中国经济腾飞后的十年巨变。作为在中国生活近十年的外国人，竹内亮导演在完成十年之约的同时，也希望让世界看到真实的中国人、真实的中国。电影版由竹内导演的重新剪辑，将带给观众全新的视听体验。
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