Parallel-world

The bald sparrow Stasyan finds a way to take off and sets off across the sky, on a trip around the world, but circumstances force him to stop and be captured by mutants of the exploded reactor of the Chernobyl nuclear power plant. They get hungry and Stasyan, at the cost of his life, invites them to follow to the Chelyabinsk region, PA "Mayak", in search of the same as they are, but at the end unforeseen circumstances await them.