Penguin Highway (2018)

The inquisitive fourth-grader of Aoyama keeps a diary, where he writes all his discoveries and experiments. One day penguins appear inexplicably in his hometown far from the sea coast. And on the outskirts of the city there is a certain unearthly oceanic sphere. The boy undertakes to unravel this amazing phenomenon, which turns out to be connected not only with his life, but also with the fate of the whole world.