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Children Who Chase Lost Voices - Wikipedia

Children Who Chase Lost Voices (星を追う子ども, Hoshi wo Ou Kodomo, lit. "Children Who Chase Stars"), also known as Journey to Agartha,[1] is a 2011 Japanese anime film created and directed by Makoto Shinkai, following his previous work 5 Centimeters per Second. This film is his longest animation film to date and is described as a "lively" animated film with adventure, action, and romance centered on a cheerful and spirited girl on a journey to say "farewell".
https://en.wikipedia.org/wiki/Children_Who_Chase_Lost_Voices