Animated short film about a boy that spent his whole life in a cage and when he escapes, he discovers that his heart was physically attached to the birdcage

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I watched it around 2015, it was animated andit only features one boy, the protagonist, who dies at the end. The heart was tattached by a thin rope if I’m not mistaken

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Hello, is it “The Boy and the Beast” by Masaaki Yuasa?
(Part of the “Genius Party Beyond” anthology, which features several short films by different directors)